MXPA98006517A - Radiographic elements for image formation medical diagnosis mammography - Google Patents

Abstract

A radiographic element for mammographic medical diagnosis is described having emulsion layers coated on opposite surfaces of a transparent film support. To facilitate rapid processing, the emulsion layers are fully subjected to rapid hardening and less than 35 mg / dm2 of hydrophilic colloid is coated on each major surface. To reduce cross-point and hydrophilic colloid, each of the emulsions on opposite sides of the support is divided into two layers, with the coated layer closer to the support containing a particulate dye capable of discoloring during processing. Silver halide grains and particulate dye together represent between 30 and 70 percent of total weight of the emulsion layers. Combined with the use of spectrally sensitized tabular grain emulsions, the crossing point can be reduced to less than 15 percent, while it can be completed in processing in less than 45 seconds. The distribution of selected silver halide and hydrophilic colloid grains achieve low wet pressure sensitivity, reduce the coefficient of variation of radiation-sensitive silver halide grains by less than 15 percent, and incorporate a rhodium adulterant at a concentration standard molar lower 1 X 10-7 with silver base, allows that contrasts of lower and average scale currently used for mammographic image formation are satisfied without any significant reduction in photographic speed

Description

RADIOGRAPHIC ELEMENTS FOR IMAGE FORMATION FOR MAMMOGRAPHIC MEDICAL DIAGNOSTICS The invention relates to radiographic elements that contain silver-halide emulsions sensitive to radiation, adapted to be exposed by a pair of intensifying screens. With reference to grains and emulsions containing two or more halides, the halides are named in order of ascending concentrations. The term "high bromide content" with reference to grains and emulsions indicates that bromide is present in a concentration greater than 50 mole percent, based on silver. The term "normalized molar concentration", referring to rhodium concentrations are base in silver, indicates the number of gram-molecular weights of rhodium present per gram-molecular weight of silver, divided (normalized) by the number of rhodium atoms present in the molecule that contains rhodium. The term "equivalent circular diameter" or "ECD" is used to indicate the diameter of a circle that has the same projected area as a silver halide grain. The term "dimension ratio" refers to the grain thickness ratio ECD to grain (t).

The term "tabular grain" indicates a grain having two parallel crystal faces, which are clearly larger than any remaining crystal faces and a ratio of dimensions of at least 2. The term "tabular grain emulsion" refers to a emulsion where tabular grains represent more than 50 percent of the total projected grain area. The term "coefficient of variation" or "COV" (Coefficient of Variation), is defined as the standard deviation (s) of grain ECD divided by average grain ECD. VOC is multiplied by 100, when set as a percentage. The term "log E" is used to indicate the exposure log in lux-seconds. The term "medium-scale contrast" or "MSC" (Medium Scale Contrast), is defined as a slope of a line drawn between points of characteristic curve at densities of 0.25 and 2.0 on minimum density (D-, in). The term "minor scale contrast" or "LSC" (Lower Scale Contrast) is defined as the slope of a line drawn between a first characteristic curve reference point at a density of 0.85 on the minimum density and a second point of reference of least exposure in the characteristic curve separated from the first reference point by an exposure difference of 0.3 log E.

The terms "frontal" and "posterior", with reference to radiographic image formation, are used to designate sites closer to and away from, respectively, the source of X-radiation than the support of the radiographic element. The term "dual coated" is used to indicate a radiographic element that has emulsion layers coated on both the front and back sides of its support. R The term "crossing point" refers to the light emitted by an intensifying screen, mounted adjacent to one side of a double-coated radiographic element, which is absorbed by one or more layers of emulsion on the opposite side of the radiographic element support. The term "total processing" refers to processing that occurs between the time an image-exposed element is fed into a processor and the time when the element emerges dry. The processing steps include developing, fixing, washing and drying. The term "fast access processing" refers to total processing in less than 90 seconds. The term "total preliminary hardening" means that the hydrophilic colloid layers are preliminarily hardened in an amount sufficient to reduce the swelling of these layers to less than 300 percent, the percent swelling is determined by (a) incubating the radiographic element at 38 ° C for 3 days at 50 percent relative humidity, (b) measure the layer thickness, (c) immerse the radiographic element in distilled water at 2l "C for 3 minutes and (d) determine the percentage change in layer thickness compared to the layer thickness measured in step (b)., is published by Kenneth Mason Publications, Ltd., Dudley House, 12 North St., Emsworth, Hampshire P010 7DQ, England. In medical diagnostic imaging, X-radiation is passed through a portion of a patient's anatomy. The X-radiation pattern passing through the patient is recorded in one or more radiation-sensitive emulsion layers of a radiographic film. To reduce the amount of X-radiation to which the patient must undergo, the radiographic element is commonly dually coated - that is, emulsion layers are coated on the front and back sides of the support. This reduses the amount of X-radiation required to form an image in half. A much greater reduction in X-ray exposure is achieved by using an intensifying screen to absorb X-radiation and emit light to the radiographic element, to capture by a layer of silver halide emulsion. Dural-coated radiographic elements are usually placed between a pair of intensifying screens and mounted on a cartridge for exposure. With this structure, the patient's exposure can be less than one twentieth of that which would otherwise be required to expose a simple emulsion layer directly by X-radiation exposure as an imaging form. For most applications, the speed advantage (reduction of exposure to X-radiation) more than compensates for reductions in image sharpness attributable to the point of sruse. There is no simple radiographic element that serves all needs of medical diagnoses. The degree to which sual is absorbed radiasion-X varies widely from one anatomical region to the next. For example, the lungs, which are filled with air, absorb relatively low levels of X-radiation, while much higher levels of X-radiation are absorbed in heart imaging. Also, the features that are sought for observation may already differ markedly in their X-radiation absorption from the adjacent anatomy, such as a clean break in a bone, or may differ only slightly such as a soft tissue injury or abnormality.

The needs of mammographic diagnosis challenge the capabilities of radiographic image formation. An advanced cancer or carcinoma can easily be identified, but the diagnostic goal to maximize survival rates is to identify fatigued and presumptuous growth at the earliest possible stage of development. This is a challenge, since the anatomical sarasteristics that is looked for in its first stages, is a small microsalysis and the differences in X-radiation absorption between these faces and healthy tissue are not large. The types of radiographic elements most generally employed for medical diagnostic imaging, with variations of specific diagnostic applications, are dual coated elements containing tabular grain emulsion layers on the front and back sides of the support. For example, Díckerson et al., In the patent of the U.S.A. No. 4,900,652, describes a radiographic element that is capable of producing maximum densities in the range of 3 to 4, exhibits reduced cruse point and low sensitivity to wet pressure, and can be fully worked in a fast transport processor in less than 90 seconds. The radiographic element is constituted by a layer of tabular grain emulsion sensitized espestrally on each opposite side of a transparent film support and processing dye particles, bleachable in solvation in hydrophilic soleide plates interspersed between the emulsion layers and the support. Hydrophilic colloid on all side of the support is in the range from 35 to 65 mg / dm2, they are the intercalated layer containing hydrophilic colloid in the amount of at least 10 mg / dm2. Dickerson and collaborators, advances significantly in the state of the technique. The emulsion of tabular grain espestral sens sensitized reduse point levels of sruse from 30 percent to approximately 20 per feel. The dye particles further reduce crossover point to less than 10 percent, with the ability to essentially eliminate crossing point. Tabular grain emulsions also provide high hiding power, allow complete preliminary hardening and lower silver coatings to achieve maximum image densities in the range of 3 to 4. Dickerson et al. Describe that 35 mg / dm2 of hydrophilic colloid in sada superfisie prinsipal of the support, be the minimum sanctity compatible with achieving low sensitivity of wet pressure. Luckey et al., In the U.S. patent. No. 4,710,637 discloses a structure consisting of a pair of intensifying screens and a dual coated radiographic element, for use in soft tissue imaging. Although a stricture of this type is used for mammographic imaging, the image quality is judged inferior by radiologists and the structure receives limited acceptance before its somersial availability is interrupted. X-ray medical diagnostic elements intended for mammographic imaging, which have been more widely asected by radiologists, contain a radiation-sensitive emulsion layer containing non-tabular silver halide grains. The one-sided emulsion emulsion coating format maximizes image sharpness by avoiding cruse point. The non-tabular silver halide grains allow superior sontrasts, partially superior slabs of lower essala. These radiographic elements, such as those of Dickerson and formerly welders, can be worked out in less than 90 seconds, but are unlikely to satisfy significantly lower overall pros- age times. Dickerson in the US patent. No. 5,576,156, discloses a radiographic element having emulsion sheets coated on opposite superfisies of a transparent film support. To facilitate rapid processing, the emulsion layers are preliminarily hardened completely and less than 35 mg / dm2 of hydrophilic colloid, are coated on each main surface. To reduce cross-point and hydrophilic colloid, each of the emulsions on opposite sides of the support is divided into two layers with the coated layer closer to the support containing a particulate dye capable of discoloring during processing. Silver halide grains and particulate dye together represent between 30 and 70 percent of the total weight of the emulsion layers. Combined with the use of spectrally sensitized tabular grain emulsions, crossover can be reduced to less than 15 percent while processing can be completed in less than 45 seconds. The distribution of hydrophilic colloid and selected silver halide grains achieves low sensitivity of wet pressure. What the technique has been unsuccessful to achieve before this invention, is to build a radiographic diagnostic medical element capable of achieving the high-quality features of image of the best performing mammographic elements currently available, while allowing acceptable maximum densities to be achieved by low silver coating coverages and allowing the shortest total processing times currently sought to be achieved while maintaining low levels of pressure sensitivity wet. The purpose of the present invention is to provide a medical diagnostic radiographic element that can adjust the faces of image output performance of existing mammographic elements, achieve maximum densities greater than 3.6, with lower silver coating coverage, by employing emulsions of tabular grain and allow processing times to be reduced to less than 60 seconds, less than 45 seconds and even less than 35 seconds. In one aspect, this invention is directed to a radiographic element comprising a film support having first and second major surfaces and capable of transmitting radiation to which the radiographic element responds and coated on one of the main surfaces, processing layers of solution-permeable hydrophilic colloid, which preliminarily harden completely, including at least one emulsion comprising silver halide grains, a spectral sensitizing solderant which is adsorbed by the silver halide grains, and a particulate colorant (a) capable of absorbing radiation to which the silver halide grains respond, (b) present in an amount sufficient to reduce cruse point to less than 15 per cent and feel capable of being substantially discolored during processing, characterized by rapid facilitation processing and low sensitivity of wet pressure, the silver halide grains are coated to a cobert ura able to provide a maximum density of total radiographic element to process, greater than 3.6, less than 35 mg / dm2 of hydrophilic colloid are coated on each of the main surfaces of the support, first and second of the layers of hydrophilic colloid, each one containing a tabular grain emulsion is coated on each main surface of the support, with the first layers located more sersa of the support than the second sapas, the second layers contain (a) silver halide grains representing 30 to 70 percent of the total weight of the second layers and represent more than 50 percent of the projected area of total grain within the second layers, and (b) from 20 to 80 percent of the total silver that form the silver halide grains within the radiographic element, the first layers contain (a) the dye particles and (b) from 20 to 80 percent of the total silver that forms the silver halide grains inside the radiographic element The particles, dye particles and silver halide grains, together represent 30 to 70 percent of the total weight of each of the first layers and radiation-sensitive silver halide grains within the first and second layers that exhibit a coefficient of variation of equivalent symmetric diameter of grain less than 15 per cent and containing rhodium in a normalized molar concentration less than 1 X 10"7, based on silver, to provide a medium scale contrast greater than 3.0 and a lower scale contrast greater than 2.2. DESCRIPTION OF PREFERRED MODALITIES Structure A This is a structure of a radiographic element according to the invention placed between two intensifying screens. FS Front Screen SS1 Screen Support FLE Layer Emitting Luminiscence Front RE Radiographic Element FE2 Second Layer Hydrophilic Colloid Front FE1 First Layer Hydrophilic Colloid Front 51 Layer Sub-base TF Transparent Film Support 52 Layer Sub-base BEI First Layer of Posterior Hydrophilic Colloid BE2 Second Layer of Posterior Hydrophilic Colloid BS Rear Screen BLE Posterior Luminiscence Emission Layer SS2 Display Support The A stratus is shown by a radiofrequency item in the MEDiso Diagnosis that satisfies the requirements of mammographic imaging, colosada between front and rear identification screens FS and BS, replaced by SS1 and SS2 supports and the FLE and BLE layers that absorb X-radiation and emit light. Located between the suando screens are intended to form in image, the radiographic element RE that satisfies the requirements of the invention is exposed. The radiographic element is constituted by a transparent support TF, which is usually a transparent film support and is often dyed blue. To facilitate coating on the support, layers SI and S2 are shown. Sub-base layers are formed as an integral part of transparent film supports, but are not essential for all types of transparent supports. The transparent support and the sub-base layers are all transparent to the light emitted by the intensification screens and are also impervious to the procession solution. That is, they do not ingest water during prosesamiento and therefore they do not contribute to the "sesga serge" - the water that must be removed to obtain an element formed in the brain image.

First and second layers of hydrophilic colloid FE1 and FE2, respectively, are coated on the main surface of the support alone exposed to the front intensification screen. Similarly, first and second hydropileous beads of BEI and BE2 are coated on the main surface of the support placed adjacent to the subsequent intensification screen. Also usually present, but not shown, are layers of hydrophilic colloid, referred to as surface finish coatings, which superimpose FE2 and BE2 and perform the function of physically protecting the underlying hydrophilic colloid layers during handling and processing. In addition to hydrophilic colloid, finish coatings may contain agents that impart a matte finish, antistatic agents, lubricants and other aggregates that do not form an image on or near the surface of the element. It is also common practice to coat a hydrophilic colloid interlayer between a superfisher coating and the sub-emulsion saps. The seedling may contain the same types of supplements as the surface finish coating, but it is also commonly free of supplements, thus acting primarily simply to provide a smooth separation between the superfisher coating and its fillers and fillers. Sub-emulsifying emulsion sheets.

The medical diagnostic radiographic elements of the invention, which satisfy the mammographic imaging requirements, differ from radiographic elements previously available in the art by offering a combination of advantageous features that have not previously been achieved in a single radiographic element. (1) Complete preliminary endurance. (2) Maximum image densities in the range of 3 to 4. (3) Crossing point less than 15 percent. (4) Processing in less than 45 seconds. (5) Low sensitivity of wet pressure. (6) Relatively high levels of sensitivity. (7) A gap-average contrast much higher than 3.0 and a lower scale contrast much higher than 2. 2. While prior to the present invention the combination of features (l) - (7) has been considered to impose incompatible constraint requirements by a combination of careful component selection and achievement of unexpected performance characteristics, this invention is successful because First time to combine all these faces in a single radiographic element. The radiographic element SE is totally subject to preliminary hardening. This better protects the radiograph element against damage, when driving and prosecuting and if it prospects to eliminate any need to complete hardening during processing. Complete preliminary hardening is achieved by hardening the hydrophilic color layers. The levels of fol of a radiographic element totally enduresido in preliminary form, are similar to those used in preliminary hardening photographic elements. A summary of vehicles for photographic elements, including hydrophilic colloids used as peptizers and binders, and useful enduresers is contained in Research Disclosure, Vol. 389, September 1996, item 38957, Session II. Vehicles, vehicle extenders, vehicle-type supplements, and supplements relased to vehicles. Preferred vehicles for the hydrophilic colloid layers FEl, FE2, BEI and BE2 as well as the plating of protrusions, if included, are gelatin (eg gelatine treated are alkali, or gelatin treated with acid) and gelatin derivatives (eg gelatine) acetylated or gelatine phthalate). Although sonorific enduresers can be used more or less interchangeably, are little or no impact on performance, the class of bis (vinylsulfonyl) enduresers, such as bis (vinyl-sulfonyl) alkyl ether or the bis (vinylsulfonyl) endurers are particularly preferred. Alkane, wherein the alkyl portion contains from 1 to 4 carbon atoms. For the radiographic element to be capable of forming an image, at least one silver-halide emulsion sensitive to radiation must be included. The full preliminary hardening sarasteristics (1) restricts the selections of silver halide emulsions in the following way: It is well known in the art that the silver image coverage power can decline as a function of increased levels of preliminary hardening . Covering power is expressed as image density divided by silver coating coverage. For example, Dickerson in U.S. Pat. No. 4,414,304, defines the hedging power as 100 times the maximum density ratio for revealed silver, expressed in mg / dm2. Dickerson resonated that tabular grain emulsions are less susceptible to rediscount in hedging power with increased levels of preliminary hardening. If the hydrophilic solor layers are not preliminarily hardened in a somatic form, exsessive water re-sorption during prosesamiento, avoids the prosesamiento in less than 45 seconds, characteristic (4). If tabular grain emulsions are not used, excessive amounts of silver must be coated to achieve characteristic (2), and characteristics (4) and (5) can not be achieved. If the hydrophilic colloid is increased in proportion to the increase in silver, processing can not be completed in less than 45 seconds. If the silver increases without increasing the hydrophilic colloid, the processed radiographic element will show localized density marks, indicative of roller pressure that is applied when passing the exposed element through the processor, generally referred to as wet pressure sensitivity. Tabular grain emulsions frequently exhibit higher levels of wet pressure sensitivity than non-tabular grain emulsions. With various other selections discussed below, all the sarasteristics (l) - (7) listed above can be achieved by the presence in each of the layers of hydrophilic colloid FEl, FE2, BEI and BE2 in at least one tabular grain emulsion. Spectrally sensitized, where radiation-sensitive silver halide grains exhibit a coefficient of variation (COV Coefficient of Variation) of less than 15 per cent and which are rhodium in a normalized molar sonic concentration less than 1 X 10"7, based on in the silver and collosar in the layers of hydrophilic colloid FEl and BEl, a particulate dye to aid in crossing point reduction of less than 15 percent Silver halide emulsions of tabular grains contemplated for use in the practice of the invention , can be any of the following silver halide compositions: silver chloride, silver bromide, silver iodobromide, silver chlorobromide, silver bromosulphide, and silver odosloride, silver iodide and silver iodine-bromochloride, where the mixed halides are named in order of ascending consentracíons. Since it is recognized that the presence of iodine slows the development of grain, it is advantageous to choose emulsions that do not contain iodine or only limited levels of iodine. Iodine concentrations lower than 4 per cent in mol, are based on silver, are specifically preferred. Of the three halides photographed (chloride, bromide, and iodide), silver chloride has the highest solubility and therefore strives to achieve the highest velosities of development. Therefore, it is preferred in terms of achieving characteristic (4). When the characteristics (4) and (6) are taken together, the silver-bromide and silver-bromide compositions are preferred. In order to achieve the characteristic (7) and achieve the characteristic (2) in a more convenient way, with low silver coating coatings, the tabular grain emulsions are chosen in such a way that the tabular grains have thicknesses less than 0.3 μm, preferably less than 0.2 μm, in thickness it represents more than 70 percent and preferably at least 90 percent of the projected area of total grain. Although the covering power of the tabular grains increases as its thickness is decreased, it is usually preferred to maintain average tabular grain thicknesses less than 0.1 μm, to avoid undesirable hot image tones in fully processed mammographic images. In order to avoid excessive granularity and therefore high levels of image interference incompatible with identifying microcharacterizations in mammographic images, it is contemplated to employ tabular grain emulsions with average ECD's of less than 3.0 μm and preferably less than 2.5 μm. Radiation-sensitive silver halide grains in the first and second layers of hydrophobic colloids have multiple substances below 15 per cent and preferably less than 10 per cent. These relatively low levels of grain ECD dispersity provide an essential contribution to satisfying characteristic (7) above. Tabular grain emulsions satisfying the requirements of the invention can be prepared with low coefficients of variation by employing techniques such as those illustrated by Research Disclosure, item 38957, I. Emulsion grains and their preparation, I. Grains emulsion and their preparation, Blends, layers and perfromance charasteristiss (I. Emulsion Grains and their Preparation, E. Mixtures, layers and performance characteristics), paragraph (2). Preferred emulsion precipitates that produce tabular grain emulsions with VOC's of less than 15 percent and preferred forms of less than 10 percent are described by Tsaur et al., U.S. Pat. Nos. 5,147,771; U.S. Patent No. 5,147,772, U.S. Pat. No. 5,147,773, U.S. Pat. No. 5,147,774, and US patent. No. 5,210,013; Kim and co-workers in the US patent. No. 5,236,817 and the US patent. No. 5,272,048; and Sutton et al., in the U.S. patent. No. 5,300,413. In more conventional film constructions, the selection of tabular grain emulsions is low for several reasons, they will allow medium-range stencils and lower slabs in a useful range to achieve radiography. Detrimentally, to achieve simultaneous total processing in less than 45 seconds and cruse point in less than 15 per cent, the radiographic elements of this invention require the presence of solder particles in the first hydraphylyal soleid sapes. This avoids that aseptables of average and inferior scale are achieved simply by decreasing grain size dispersal (that is, reducing VOC). It has been discovered quite unexpectedly that the addition of limited amounts of rhodium as an adulterant in radiation-sensitive silver halide grains is capable of increasing medium-scale and lower-scale contrasts in acceptable ranges for mammographic imaging without any significant adverse effect on the speed of image formation. Keller in "Science and Technology of Photography", VCH, New York, 1993, on page 40, states: A fundamentally different approach to higher gradation values is the adulteration of con-metal emulsion grains heavy such are those of rhodium, cadmium, lead and bismuth. The adulteration pushes back the heel of the surva sarasteristisa and produces a steep gradient. The expression "pushes back the heel" simply means that more exposure of light is required before the density rises above a minimum level. While the technique until the end of the year has been considered unbearable to achieve increased rhodium-enhanced strings with maintaining high levels of image speed, it has been observed that by limiting the rhodium adulterant to a standardized molar concentration less than 1 X 10 ~ 7 with silver base , no significant reduction in velocity is observed. This observation is particularly important for mammography. For many types of image-forming applications, a redussion of veility attributable to adulterated rhodium can easily be overcome simply by increasing the average ECD of silver halide grains, since it is well known that the veiliness of image shaping is generally Increase the average grain sizes. However, the small sizes of misrosalifisations that are sought to identify limit the freedom to increase the average grain size, since the latter also increases the granularity (image interference). Attempting medical diagnosis with granular images runs a significant risk of failing to identify the presence of microsalsifisasione. It has been discovered quite unexpectedly that the improvement of the non-reductive sign in the veil of image formation can be achieved by limiting the standardized molar concentration of rhodium to less than 1 X 10 ~ 7 with silver base. Any lower concentration of rhodium can be used that raises the contrasts of average and lower scale over 3.0 and 2.2, respectively. In most cases, it is contemplated that rhodium will be present in a normalized molar consension at least 1 x 10 ** 9, are silver based, and more typically rhodium standardized molar concentrations in the range of 5 X are preferred. 10 ~ 9 to 5 X 10"ß are silver based, any conventional rhodium resin which is useful in adulterating silver halide grains may be employed in the practice of the invention. Conventional halide silver, dessriben by Research Disclosure, item 38957, "I. E ulsions and their preparation, D. Grain modif ing sonditions and adjustments, paragraphs (3), (4) and (5) (I. Emulsions and their preparation, D. Condi- tions and Adjustments for Grain Modi fi cation, paragraphs (3), (4) and (5)) Rhodium can be introduced with a simple salt, preferably a halide salt, rhodium is now considered to form a hexacoordination complex In this way, in most sasos, rhodium hexahalide adulterants are preferred up to 2 halide atoms which are replaced in osasions are asuo ligands. Rhodium compounds are chloride and bromide Paragraphs (4) and (5) provide specific illustrations of other ligands, including organic ligands, which may be present in the complexes of rhodium-containing hexagon.Rhodium adulterants are compatible with other interfering additives. Rhodium combinations and adulterants that increase speed, particularly adulterants that trap shallow electrons, such as those described in Research Disclosure, Vol. 367, November 1994, item 36736, and Olm et al. USA No. 5,503,970, are contemplated espesífisamente. Conventional iridium adulterants can also be used in combination are rhodium adulterants * Iridium adulterants, such as rhodium adulterants, are considered to enter the crystal lattice of silver halide grains as hexacoordination complexes, more somun complex coordination complexes iridium hexahalide. When tabular grain emulsions are used that satisfy the previously established requirements, total silver coating openings in the range greater than 35, are sapases before prosecution, to produce a silver image having a maximum density greater than 3.6. It is preferred to use silver coating coatings in the range of >35 to 60 mg / dm2. Superior silver coating coverages are unnecessary, since maximum densities greater than 4 provide additional visually accessible image information. If all radiation-sensitive silver halide grains are spectrally sensitized, this alone is able to reduce the point of crushing to just under 20 times as I feel as illustrated by Abbott et al. In U.S. Patents. Nos. 4,425,425 and 4,425,426 (hereinafter referred to collectively as Abbott et al.). All references to crossing point percentages are based on the crossing point measurement technique described by Abbott et al., Incorporated herein by reference. The point of cruse of a radiographic element of agreement is the invention under the contemplated sondisiones of exposition and processing, can be determined by replacing a black object (for example kraft paper) with one of two screens of interestation. To provide a verifiable standard for measuring the crossing point percent, the exposure and processing described in the Examples below will be employed. Exposure through a test object with progressive density primarily exposes the emulsion on the side of the radiographic element closer to the intensification screen, but the emulsion on the side of the radiographic element further away from the intensification screen is also exposed, although in a more limited proportion by the unabsorbed light that passes through the support. When removing the emulsion from the side of the support closest to the intensification screen in one sample and the side of the support farthest from the intensification screen in another sample, a characteristic curve (density versus log E, where E is the light that passes through the step test object) can be traced for each remaining emulsion. The characteristic curve of the emulsion on the side furthest from the source of replaced light shifts laterally in comparison with the curve of the emulsion on the more sersan side to the substituted light source. An average displacement (delta log E) is determined and used to salculate percent crossing point as follows: (I) For the point of sruse = 1 X 1G0 antilog (delta log E) If the screen emission is in the Spectral region to which the silver halide possesses native sensitivity, then the silver halide grains themselves contribute to light absorption and therefore to cruse point reduction. This has a significant propulsion only at exposure wavelengths below 425 nm. The espestral sensitizing dye that is adsorbed on the grain surfaces, is based primarily on the absorption of light emitted by the screens. The silver halide emulsions can contain any dye or co-biosion of conventional sonic sensitizing odorants which are absorbed in the grain super fi cials. Absorption maximums of soldering agents are usually the maximum emission of the screens, in such a way that maximum efficiency of light capture is achieved. To bring the maximum speed (6) and minimize sruce point (3), it is preferred to adsorb dye to the grain surfaces in a substantially optimum amount - that is, in an amount sufficient to achieve at least 60 percent maximum low speed the contemplated conditions of exposure and processing. To provide an objective standard by reference, the exposure and prosecution conditions set forth in the following Examples may be employed. Illustrations of thickener sensitizing solvents, useful with the radiographic elements of the invention, are provided by Kofron and collaborators, in the patent of the U.S. No. 4,439,520, particularly from its list of blue thickener sensitizing solvents. Abbott and collaborators in the U.S. patent. No. 4, 425, 425 and in the U.S. patent. No. 4,425,426, also illustrate the use of spectral sensitizing odorants to reduce cruse point. A more general summary of thickener sensitizing solvents is provided by Research Disclos re, item 38957, previously reported, Sessión V. Sensibilization and Espestral Desensitization, A. Sensitizing colorants. To reduce the crossing point to less than 15 percent and preferably less than 10 percent, it is contemplated to introduce additional dye capable of absorbing within the exposure wavelength region in the hydrophilic color layers FEl and BEl. The additional dye is chosen to absorb exposure light which is not absorbed by the silver halide grains and spectral sensitizing dye contained in the hydrophilic soleide sacs FE2 and BE2. if the additional soldera is insorporated in the layers of hydrophilic colloid FE2 and BE2 alike, the result is a marsal reduction in photographic volatility. In addition to their absorption properties, the adisional dye must be capable of discoloration during processing. Dickerson and co-workers in US patents. Nos. 4,803,150 and 4,900,652, disclose particulate dyes capable of (a) absorbing radiasion to the sual, the silver halide grains respond to reduce the point of suse to less than 15 per cent, and (b) are substantially discolored during processing. The particulate dyes can in fact eliminate substantially point of cruse. Average ECD of the dye particles may be in the range of up to 10 μm, but preferensia is less than 1 μm. Sizes of single particles up to 0.01 μ can be formed accordingly. When the odorants are crystallized unusually in particle sizes larger than desired, conventional techniques can be employed to achieve smaller particle sizes, such as ball mill, roller mill, sand mill and the like. Since the layers of hydrophilic colloids are typically coated as aqueous solutions in the pH range from 5 to 6, more typically from 5.5 to 6.0, the colorants are chosen to remain in the form of particles at those pH levels in aqueous solutions. The dyes however must be easily soluble at the alkaline pH levels employed in photographic development. Dyes that meet these requirements are non-ionic in the coating pH range, but ionic under the alkaline pH processing levels. Preferred colorants are non-ionic polymethine dyes, which include merosianin, oxonol, hexonol, styryl and the arylidene solvents. In preferred form, the solvents are carboxylic acid substituents, since these substituents are non-ionic in the coating pH ranges, but are ionic under alsaline prostration conditions. Specific examples of particulate dyes are described by Le athieu et al. In U.S. Pat. No. 4,092,168, Diehl et al WO 88/04795 and EPO 0 274 723, and Factor et al. EPO 0 299 435, Factor et al. In U.S. Pat. No. 4,900,653, Diehl et al. In the U.S. patent. No. 4,940,654 (dyes with groups that have ionizable protons other than carboxy), Factor et al. In U.S. Pat. No. 4,948,718 (arylpyrazolone nusleos), Diehl and co-workers in U.S. Pat. No. 4,950,586, Anderson and co-developers in U.S. Patent No. 4,988,611 (particle size ranges and values of pKa substituents), Diehl and co-developers in U.S. Pat. No. 4,994,356, Usagawa et al. In U.S. Pat. No. 5,208,137, Adachi in U.S. Pat. No. 5,213,957 (erocyanines), Usa i in U.S. Pat. No. 5,238,798 (pyrazolone oxonols), Usami and co-workers in U.S. Pat. No. 5,238,799 (pyrazolone oxonols), Diehl and co-workers in U.S. Pat. No. 5, 213,956 (trisianopropenos and others), Inagaki and collaborators in the patent of the U.S.A. Do not. ,075,205, Otp et al. In the patent of the U.S.A. No. 5,098,818, Texter in U.S. Pat. No. 5,274,109, McManus and co-workers in the U.S. patent. No. 5,098,820, Inagaki and co-workers in the EPO patent 0 385 461, Fujita and co-workers in the EPO patent 0 423 693, Usui in EPO patent 0 423 742 (which are groups with specific pKa values), Usagawa and co-workers EPO 0434413 (pyrazolones are particular sulfamollo, carboxyl substituents and the like), Jimbo et al. in EPO patent 0 460 550, Diehl et al. in EPO patent 0 524 593 (which have phenyl substituents substituted with alsoxy or cyclic ether), Diehl et al. the EPO patent 0524594 (furan substituents) and Ohno in the EPO patent or 552 646 (oxonols). If all the silver halide halide required to form in image is located in the layers of hydrophilic colloids FE2 and BE2, it is impossible to satisfy the sensorial surfaces (4) and (5). If the hydrophobic soleide is reduced to less than 35 mg / dm2 per side, processing can be achieved in less than 45 seconds (4), but high levels of wet pressure sensitivity are observed. The sensitivity to wet pressure is observed as heterogeneous optical densities in the fully processed image, attributable to differences in guide roller pressures applied in fast processing. If the amount of hydrophilic colloid in layers FE2 and BE2 is increased in a proportion necessary to eliminate visible wet pressure sensitivity, the radiographic element can not be processed in less than 45 seconds. It has been discovered that successful rapid processing and low sensitivity levels of wet prostration can both be realized, if a portion of the silver halide sensitive to spectrally sensitized radiation that is based for image-forming, is insorporated in the FEL hydrophilic solids sapes and Bel. Surpngly, as shown in the Examples below, when a portion of the radically-sensed, radically-sensed silver halide is coated on the hydrophobic solids sapphires which are the partisan solder used for redussion of the sruse point, they will still be retained. photo levels totally acceptable. This is in direct contradiction with observations that in mixed silver halide emulsion and particulate dye in a single hydrophilic colloid, results in unacceptably low levels of photographic speed. By incorporating both a portion of the silver halide emulsion and the particulate dye in layers of hydrophilic colloids FEl and BEl, it is possible to reduce the total coverage of hydrophilic colloid by the radiographic elements of the invention to less than 35 mg / dm2, preferensia less than 33 mg / dm2 while the sarasteisas are satisfied (1) ~ (7). In preferred embodiments of the invention, the low levels of hydrophilic colloid per side allow the processing characteic (4) to be reduced to less than 35 seconds. To satisfy the faces (l) - (7) of 20 to 80 (preferably 30 to 70) of the total silver that forms the radiographic element, it must be contained in the layers of hydrophilic colloids FE2 and BE2. Similarly, from 20 to 80 (preferably 30 to 70) percent of the total silver that forms the radiographic element must be contained in the hydrophilic solids plates FEl and BEl. In general it is preferred that at least 50 percent of the total silver that forms the radiographic element is contained in the layers of hydrophilic colloids FE2 and BE2. In addition to satisfying the characteics (l) - (7), the silver halide grains in the layers of hydrophilic colloids FE2 and BE2 represent from 30 to 70 (preferably 40 to 60) percent of the total weight of these layers. Similarly, in layers of hydrophilic colloids FEl and BEl, the silver halide grains and dye particles together represent from 30 to 70 (preferensia 40 to 60) percent of the total weight of these layers. Specific selections of remaining characteics of the radiographic element RE, they can take any suitable conventional form compatible with the description provided. For example, transparent film supports and sub-base plates that are typically provided in their main surfaces to improve the adhesion of hydrophilic solids webs are described in Research Disclosure, Item 38957, Session XV. Supports and Research Disclosure, item 18431, Session XII. Stands of Pelisula. Chemical sensitization of the emulsion is described in Research Disclosure, item 36544, Section IV. Chemical Sensitization and Research Disclosure, item 18431, Secsión I.C. Sensitization chemmises / Crystals Adulterated. The chemical sensitization of tabular grain emulsions is illustrated more particularly in Kofron and co-workers in U.S. Pat. No. 4,429,520, The following sessions of Research Disclosure, item 18431 summarize additional features that are applicable to the radiographic elements of the invention: II. Emulsion Stabilizers, Antifog Agents and Anti-torsion III. Antistatic Agents / Layers IV. Layers of Final Coating The following sessions of Research Disclosure, item 38957 summarize additional sarasteristisas aplying the radiographic elements of the invention: VII. Anti-fog and stabilizers IX. Modifiable additives of coating physical properties A. Coating auxiliaries B. Plasticizers and lubricants C. Antistatics D. Matte agents EXAMPLES The invention can be best appreciated when considered in connection with the following specific embodiments. The letters C and E are added to item numbers to differentiate radiographic control and exemplary elements. All coating coverages are given in mg / dm2, except as indicated otherwise. Radiographic Element A (Control) A sonographic side-sensing mammographic element is provided, which has the following format: Sawing coating Superfisie fSQC) Entresapa (ID Emulsion Layer (EL) Tranepant Pelisula Support Capa Peloide (PL) ov Surface fSOCl Coating Surface Finishing fSOC) Contents Coverage Gelatin 3.4 Poly (methyl methacrylate) beads 0.14 Carboxymethyl casein 0.57 Colloidal silica 0.57 Polyacrylamide 0.57 Chromium alum 0.025 Resorcinol 0.058 Whale oil lubricant 0.15 Entresapa CID Contents Coverage Gelatin 3.4 Agí Lippman 0.11 Carboxymethyl sasein 0.57 Sílise soloidal 0.57 Poliasrilamide 0.57 Alum alum 0.025 Resorsinol 0.058 Nitrón 0.044 Emulsion Layer (EL) Contents Coverage Ag 43.0 Gelatine 43.0 4-Hydroxy-6-methyl-l, 3,3a, 7-tetraazaindene 2.1 g / Ag mol Potassium nitrate 1.8 Ammonium hexachloropallate 0.0022 Abate acid hydrazide 0.0087 Sorbitol 0.53 Glycerin 0.57 Potassium bromide 0.14 Resorsinol 0.44 Bis (vinylsulfonylmethyl) ether 0.7% (based on the weight of gelatin in all the plates on the front side of the support) Capa peloide Contents Coverage Gelatin 43.0 Dye AH-l 2.4 Dye AH-2 ll Dye AH-3 0.8 Dye AH-4 6.9 Bis (vinylsulfonylmethyl) ether 2.4% (they are base by weight of gelatin on the back side of the support) The transparent film support was a transparent polyester film holder dyed 177.8 μm (7 mils).

The silver halide emulsion employed was an emulsion of green sensitized silver iodobromide containing 1% mol of iodide, based on silver. The silver halide grains were non-tabular and exhibited an average ECD of 0.7 μm. The emulsion was chemically sensitized with sodium thiosulfate, potassium tetrachloroaurate, sodium thiocyanate and potassium selenosanate and sensitized spectrally with 170 mg / Ag mol of anhydrous hydroxide-5,5-disul-9-ethyl-3'- bis (3-sulfopropyl) -oxasarbosianine (SS-1 dye). The anti-halo dyes were used: AH-l. Bis [3-methyl-1- (p-sulfophenyl) -2-pyrazolin-5-one- (4) Jmonomethynaoxonol. AH-2. Bis (l-butyl-3-carboxymethyl-5-barbiturase acid) trimethinoxonol. AH-3. 4- [4- (3-ethyl-2 (3H) -benzoxazolylidene-2-butenylidene] -3-methyl-lp-sulfonyl-2-pyrazolin-5-one, monosulfonated, AH-4, Bis [3-methyl- l- (p-sulfophenyl) -2-pyrazolin-5-one- (4)] pentametinaoxonol Radiographic Element B (Example) Radiographic Element B was a dual coated radiographic element exhibiting the following total format: Grinding Coating or Q fisie (SOO Entresapa (ID Emulsion Layer Finishing Coat fQEL) Underlying Emulsion Layer (UEL) Transparent Film Support Underlying Emulsion Layer (UEL) Emulsion Layer Finishing Coating (QEL) Interlayer (ID Finishing Coating Surface (SOC) The same support is used as in the X-ray control element A. In the superimposed and underlying emulsion layers, an emulsion of tabular-grained silver bromide, Emulsion T, was used. The Emulsion T is presipred in the following way: In an 18-liter reassum filtrate, a solusy of asuosa gelatin is soldered by 6 liters of water, 7.5 g of gelatine prosed with alkali, treated with an oxidizing agent to reduce methionine (continued referred to as oxidized gelatin), 8.9 mL of solid 4 M nitrid solution, 3.8 g of sodium bromide and 0.60 g of Pluronium * 4 31R1, which satiefase the formula: HO- [CH (CH3) CH20] x- (CH2CH20) y- [CH2 (CH3) CH] X'-H xyx 'sada one = 25 ey = 7. At 45DC, 50 L of a nitrate eolusion of 0.50 M aqueous silver and 49 mL of a 0.53 M aqueous sodium bromide solution were added simultaneously for a period of 1 minute to a constant viscosity. Then, 115 mL of a 1M asuosa sodium bromide solution is added to the mixture. After 1 minute of mixing, the temperature is raised to 60 ° C for a period of 9 minutes. At this time, 100 mL of 1.15 M asuous ammonium sulfate solution and 130 mL of a 2.5 M sodium hydroxide solution are added. The mixture is stirred for a period of 9 minutes. Then, the mixture is added to 1.5 L of a solution of asuosa gelatin, put up by 100 g of oxidized gelatin, 25.52 mL of a solid solution of 4 M nitride and 0.15 g of PluronisMR 31R1. The mixture is stirred for a period of 2 minutes. Subsequently, 150 mL of a solution of 0.50 M aqueous silver nitrate and 155 L of a 0.53 M aqueous sodium bromide solution are added simultaneously at a constant rate for a period of 10 minutes. Then 2.92 L of a 2.60 M aqueous silver nitrate solution and 2.90 L of a 2.68 M aqueous sodium bromide solution which is 0.86 L of a solvate of 0.146 mM (III) ammonium hexasorbordide were added simultaneously to the mixture. a steady ramp that starts from resinous vents from 5.0 mL / min and 5.2 mL / min from the substeps 79 minutes. Then 1.39 L of a 2.6 M asuosa silver nitrate solution and 1.38 L of a 2.68 M asuosa sodium bromide solution with 0.45 L of aqueous ammonium hexachlorodate (III), 0.146 mM were added simultaneously to the mixture at a constant rate during a period of 20.2 minutes and 1.2 minutes in this period, 2 mL of a solution of potassium solvated hexachloroiridate (IV) at 0.12 mM are added over a period of 2 minutes. The emulsion was then washed. Emulsion T had an average grain ECD of 2.0 μm and an average grain thickness of 0.13 μm. Tabular grains represent more than 90 per cent of the projected area of total grain, and the VOC of average emulsion size was 7 per cent. The silver bromide grains were adulterated with 9.7 X 10 ~ 9 mol per mol of rhodium silver introduced by the addition of during grain precipitation. Iridium is added as an adulterant to reduce the failure of reciprocity, since mammographic films in various uses have widely varying exposure times. The tabular grain emulsion is sensitized by sodium thiosulfate, potassium tetrasloroaurate, sodium thiocyanate and potassium selenocyanate and sensitizes spectrally with 400 mg / Ag mole of SS-1 Colorant, followed by 300 mg / Ag mole of potassium iodide .

Finish Coating Emulsion Layer (OEL) Contents Coverage Ag 10.8 Gelatin 12 5.0 4-Hydroxy-6-methyl-l, 3,3a, 7-tetraazaindene > 2. .1 g / Ag mol Potassium Nitrate 0. 83 Hexachloropallate Ammonium 0.001 Hydroxide of Maleic Acid 0., 0044 Sorbitol 0., 24 Glycerin 0. 26 Potassium bromide 0. .14 Resorcinol 0. 2 Underlying Emulsion Layer (UEL) Contents Coverage Ag 10.8 Gelatin 13.0 Microscristalline dye 1. .08 4-Hydroxy-6-methyl-l, 3, 3a, 7-tetraazaindenoi 2., 1 g / Ag mol Potassium Nitrate 0.83 Ammonium Hexasorphollate 0.001 Overside Maleisoxide 0.0044 Sorbitol 0. 24 Glycerin 0.26 Potassium bromide 0. 06 Resorcinol 0. 2 Bis (vinyl sulfonyl ethyl) ether 2.5% (they are base in weight of gelatin in all the cups on the same side coated with the support). The microcrystalline odorant was l- (4'-sarbo ifenyl) -4- (4'-dimethylaminobenzilidene) -3-ethoxysarbonyl-2-pyrazolin-5-one. Interlayer (IL) Contents Coverage Gelatin 3.4 Agí Lippman 0.11 Carboxymethyl casein 0.57 Sílise soloidal 0.57 Polyacrylamide 0.57 Chromium alum 0.025 Resorcinol 0.058 Nitron 0.044 Final surface coating (SOC) Contents Coverage Gelatin 3.4 Poly (methyl methacrylate) beads 0.14 Carboxymethyl casein 0.57 Silica colloidal 0.57 Polyacrylamide 0.57 Chromium alum 0.025 Resorcinol 0.058 Lubricant of whale aseal 0.15 Radiographic element C (Control) This radiographic element is constructed in the same way as radiographic element B, except that rhodium of adulterated silver bromine is omitted. Radiographic element D (Control) This radiographic element is constructed in an identical way to the radiographic element C, exsept because the emulsion of tabular grain used exhibits a VOC is grain size dispersivity of 38 percent. Evaluations of the revealed elements were simultaneously emitted on each side for 1/50 second through a graduated density stage tablet using a MacBeth "* sensor that has a General Elestric DMX" * 500 watt projector lamp, calibrated to 2650 ° K and it is passed through a Corning C4010HR filter (480-600 n, 530 nm peak transmission). The single-sided element was exposed similarly but only on the emulsion side. The samples were prosed using a Kodak X-Omat RA 480 pros- toador. This processor can be fitted to any of the total pros- stance cislos set forth in Table I.

Table I Cycle times in Seconds Super Extended Standard Fast Cycle KWIK K IK Revealed 44.9 27.6 15.1 11.1 8.3 Fixed 37.5 18.3 12.9 9.4 7.0 Washing 30.1 15.5 10.4 7.6 5.6 Drying 47.5 21.0 16.6 12.2 9.1 Total 160.0 82.4 55 40.3 30.0 Prosecution systems fill the following revealers and fixatives, where the somenter sonsensions are expressed in g / L: Extended, Standard and Rapid Developer Hydroquinone 30 4-Hydroxymethyl-4-methyl-1 -phenyl-3-pyrazolidinone 1.5 Potassium hydroxide 21.00 5-Methylbenzotriazole 0.06 Sodium biscarbonate 7.5 Sulfite potassium 44.2 Sodium metabisulfite 12.6 Sodium bromide 35.0 Glutaraldehyde 4.9 Water at 1 liter pH 10 Glutaraldehyde works to complete hardening of Element A, but had effect on the remaining elements that were totally subjected to preliminary hardening. Extended, Standard and Rapid Fixer Ammonium thiosulfate 60% 260 Sodium bisulphite 180 Boric acid 25 Acidic acid 10 Aluminum sulphate 8 Water at 1 liter pH 3.9 to 4.5 KwiK developer: Hydroquinone 32 4-Hydroxymethyl-4-methyl-1- -phenyl-3-pyrazolidinone 6.0 Potassium bromide 2.25 5-Methylbenzotriazole 0.125 Sodium sulphite 160 Glutaraldehyde 4.9 Water at 1 liter pH 10.5 Kwik fixative: Potassium hydroxide 3.2 Gaseous acylis acid 9.6 Ammonium thiosulfate 100 Ammonium sulphite 7.1 Tetraborate sodium pentahydrate 4.4 Asid tartatiso 3.0 Sodium metabisulphite 6.6 Ammonium sulphate 3.3 Water at 1 liter pH 4.9 Super Kwik developer: Potassium hydroxide 23 Sodium sulfite 12 l-Feni-5-mersaptotetrazole 0.02 Sessarant * 2.8 Sodium bicarbonate 7.4 Potassium sulphite 70.8 Diethylene glycol 15 Hydroquinone 30 Glutaraldehyde 3.9 Glasial acetic acid 10 l-Fenll-3-pyrazolidone 12 5-Nitroindazole 0.12 Water at 1 liter pH 10.6 * Salt of acid diethylenetriaminopen Tatasetiso pentasódisa. Fixer Super Kwik: Potassium hydroxide 7.4 Acetic acid 18 Sodium thiosulfate 16 Potassium iodide 0.08 Ammonium thiosulfate 122 Ammonium sulphite 8.6 Sodium metabisulphite 2.9 Sodium glutonate 5.0 Aluminum sulphate 7.0 Water at 1 liter pH 4.7 Glutaraldehyde works to solidify the endurance of the Element A, but had efesto poso in the remaining elements, which were totally hardened preliminary. To compare the prosecutor's ability to dry film samples, samples of the elements were exposed by flash to provide a density of 1. 0 suando are processed. As each sample of the movie begins to exit the prosecutor, the prosecutor stops and the sample is removed from the prosecutor. Roller masses were visible on the film in areas that were not bent.

A film that was not dry as it leaves the processor is assigned a dryer value in% of 100+. A film exhibiting roll marks of the first guide rollers indents, but not the last guide rollers enssntrados, indicates that the pelisula had already sesado suando passes on the last rollers, is assigned a dryer value% indicative of percentage of the rollers that guided non-dried portions of the movie. Therefore, lower dryer values% indicate faster drying film samples. To allow point determinations of sruse, samples of the elements were exposed with an intensifying screen of green emission Lanex Regulará, in contasto are one side of the sample and black kraft paper in sontasto are the other side of the sample. The source of radiasión X was a machine of X-ray of 3 phases Pisker VGX653, are a tube of approach Dunlee of High-Velosidad PX1431-CQ-150 k Vp 0.7 / 1.4. The exposition is carried out at 70 kVp, 32 mAs, at a distance of 1.40 m. The filtration was with an equivalent to 3 mm (1.25 inherent + 1.75 Al); Medium Value Layer (HVL) -2.6 mm Al. A step wedge is applied to step A26, different in thickness by 2 mm per step. The positioning of the plate is performed as previously disengaged. When removing emulsion from the side of the support more sersan to the screen in some sample locations, and from the side of the support opposite the screen in the other sample locations, the density produsida in sada side of the support in sada stage. From this survas separate sarasteristisas (density sontra log E) were drawn from sada sapa emulsion. The displacement of exposure between the curves is measured at three sites between the heel and shoulder portions of the survas and averaged to obtain delta log E for use in the (I) above equation. Significant performance characteristics are summarized in Table II. Table II% Process Cycle Item MSC LSC 55"40" 30"Crossing A NA * 3.2 2.3> 100%> 100%> 100% B 6 3.5 2.3 < 50% 60% 70% C 6 2.7 2.0 < 50% 60% 70% D 9 2.5 1.9 < 50% 60% 70% * not applicable All elements exhibit sensually similar velocity (different in <0.05 log E) measured at a density of 1.0 over minimum density. The hesho that the adulterant rhodium in Element B was able to increase contrast without reducing veils, was surprising.

All elements produce maximum densities greater than 3.6. All the elements were satisfactorily prosed using the extended (120") and standard (82") processing cycles. Only Element B, which satisfies the requirements of the invention and the Element A of digital mammography film, were able to produce a median strut test (MSC) greater than 3.0 and a lower strut test (LSC) greater than 2.2, as shown in FIG. it requires for formaión of i agen mammográfisa are aseptable salidad. From Elements C and D it is notable that a symbiosis of tabular grains having VOCs is low grain dispersivity and adulterated rhodium is required to achieve this performance sap. Only Element B, which satisfies the requirements of the invention, it was sapaz both of eatiefaser loe requirements of mammographic image formation and to undergo total processing in the times of inferior prosesamiento that are now euplantando the cycle of Standard processing. In spite of the reduced levels of gelatin in the coated radiographic elements, which underwent the same time of prostration, there was no evidence of wet pressure sensitivity in the coated films. This is attributed to distributing the silver halide grains between the superposed and sub-emulsified emulsion sheets. Seen in another way, a portion of the silver halide that Dickerson et al. In U.S. Pat. No. 4,900,652 colossally in a simple emulsion sap which superimposes the particulate dye containing the control layer of the crossing point, is transferred to the sonride point layer of sruse, to allow minor hydrophilic solids coating coatings. , without insisting on wet pressure sensitivity.

Claims (8)

1. CLAIMS 1. A radiographic element of rapid diagnosis is constituted by a film support that has first and second main surfaces capable of transmitting radiation to the surals, the radiographic element responds and coated on all sides of the prinsipal superfisies, hydrophilic solids permeable to solids. which are completely subjected to preliminary hardening, including at least one emulsion consisting of silver halide grains, a spectral sensitizing dye which is adsorbed by the silver halide grains and a particulate dye (a) capable of absorbing radiation to which the silver halide grains respond, (b) present in an amount sufficient to reduce the point of sruse to less than 15 by feeling and (s) sapaz of being substantially discolored during prosecution, CHARACTERIZED because to facilitate the image formation mammography and thus fast prosesamiento are low sensitivity of wet pressure, the silver halide grains are coated to a sapaz gap of proportions a maximum density of total radiographic element before processing greater than 3.6, less than 35 mg / dm2 of hydrophilic colloid is coated on each of the main surfaces of the support, first and second layers of hydrophilic solids, each containing a tabular grain emulsion, are coated on the top surface of the support, are the first laminated sapas more sersa of the support than the second layers, the second layers contain (a) silver halide grains that represent 30 to 70 percent of the total weight of the second layers and that represent more than 50 percent of the projected area of total grain within the second layers and (b) from 20 to 80 percent of the total silver that forms the silver halide grains within the radiographic element, the first sapas are (a) the soloing particles and (b) from 20 to 80 per cent of the total silver that forms the silver halide grains within the radiographic element, the solder particles and the silver halide grains in a joint represent 30 to 70 percent of the total weight of one of the first sapas, and halide grains of Radiation sensitive silver within the first and second sapes exhibiting a circular mass equivalent of less than 15 percent and having rhodium in a standardized molar soncentration of less than 1 X 10"7 with silver base to provide Stash test medium greater than 3.0 and a test stencil lower than 2.2.
2. 2. A radiographic element for mammographic image conformation of sonification is claim 1, which is also sarasterized because the radiation-sensitive silver halide grains exhibit a multiple coefficient of less than 10 per cent.
3. 3. A radiographic element for mammographic image shaping according to any of claims 1 or 2, further sarasterized because the rhodium adulterant is present in a normalized molar sonication greater than 1 X 10 ~ 9 are base in silver.
4. 4. A radiographic element for mammographic sonogram image formation with claim 3, also sarasterized because the rhodium adulterant is present in a normalized molar sonsension in the range of 5 X 10"9 to 1 X 10" 8 are base in silver .
5. 5. A radiographic element for mammographic image-forming of sound is any of claims 1 to 4, which is also sarasterized because the particulate solder is present as particles capable of reducing the sruse point by at least 10 per cent.
6. 6. A radiographic element for mammographic image formation according to any of claims 1 to 5, which is also sarasterized because the tabular grains have an average thickness of less than 0.1 μm.
7. 7. A radiographic element for conformational mammography imaging is any of claims 1 to 6, further characterized in that the tabular grains have a thickness less than 0.2 μm representing at least 70 percent of the projected area of total grain.
8. 8. A radiographic element for mammographic sonogram image formation is any one of claims 1 to 7, further characterized in that the radiographic element can be prossed by the following scanning system: revealed 15.1 seconds; set of 12.9 seconds; washing 10.4 seconds; scintillation of 16.6 seconds, using a hydroquinone-pyrazolidinone developer. SUMMARY OF THE INVENTION A radiographic element for diagnostic mammography is dissed which has emulsion layers coated on opposite surfaces of a transparent film support. To facilitate rapid processing, the emulsion layers are completely subjected to rapid enduring and less than 35 mg / dm2 of hydrophobic solids are coated on a prinsipal surface. In order to redirect hydrolyseous sruse and soleide point, each of the emulsions on opposite sides of the support is divided into two layers, with the coated layer more crest of the support which is a solder in sapaz particles to be discolored during processing. Silver halide grains and particulate dye together represent between 30 and 70 percent of total weight of the emulsion layers. Combined with the use of espestrally sensitized tabular grain emulsions, it can be reduced to a point of sruse a menoe of 15 per cent, whereas it can be completed in less than 45 seconds. The distribution of silver halide grains and hydrophilic soleide selestos achieve low wet pressure sensitivity. Reduce the coefficient of several radiation-sensitive silver halide grains by less than 15 percent and incorporate a rhodium adulterant at a lower normalized molar concentration 1 X 10"7 based on silver, allowing lower-scale contrasts and average currently employed for mammographic image formation are satisfied without any significant reduction in photographic velosity. ES l »/ 26 / E * S31S