JP3475361B2 - Method and apparatus for eliminating residual noise of stimulable phosphor panel - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for reading a radiation image using a stimulable phosphor panel. The present invention relates to a residual noise erasing method and an apparatus for erasing accumulated radiation energy as fluorescence and irradiating the stimulable phosphor panel after reading with erasing light to erase remaining radiation energy.

[0002]

2. Description of the Related Art Conventionally, a so-called radiographic method using a silver salt has been used to obtain a radiographic image, but in recent years, a method of visualizing a radiographic image without using a silver salt has come into use. Came.

One of the methods is a radiation image reading method using a stimulable phosphor. This is because the phosphor absorbs the radiation that has passed through or is emitted from the subject, and then the excitation light peculiar to the phosphor is irradiated to release the accumulated radiation energy as fluorescence, and this fluorescence is emitted. It is detected and converted into a visible image. Such a radiographic image conversion system has recently attracted particular attention as an alternative to the radiographic system.

[0004]

In the radiation image reading method using such a stimulable phosphor, the stimulable phosphor is repeatedly used in the form of a panel or a sheet, but the obtained image is often used. Noise may be added and the image quality may be significantly deteriorated, and a clear image may not be obtained. This is because the radiation image information accumulated in the stimulable phosphor is not sufficiently emitted only by irradiating the excitation light at the time of reading, and the previous radiation image information remaining when the image is read again is read together. This is because. Thus, among the radiation image information accumulated in the stimulable phosphor body by the radiation emitted at the time of the previous photographing, the radiation image information remaining in the stimulable phosphor body without being released by the irradiation of the excitation light at the time of the previous reading is used in the present invention. Is defined as residual noise. As a method of erasing this residual noise, Japanese Patent Laid-Open No. 56-11392 proposes a method of erasing the residual noise by irradiating the reading light and then irradiating the reading light.

On the other hand, in Japanese Patent Laid-Open No. 57-116300, the storage phosphor panel that has been read out is first irradiated with a first erasing light to erase residual noise, and then a second erasing light is emitted immediately before the next photographing. A method of irradiating to remove the radiation fog has been proposed. The radiation fog referred to here is the radiation energy accumulated in the stimulable phosphor panel by the radioactive isotope mixed in the stimulable phosphor and the radiation from the environment, and is distinguished from the residual noise.

In order to erase this residual noise to a practical use level (from 10 ⁻³ at the time of the first reading to 10 ⁻⁴ or less), it is usually
Exposure of erasing light of 1 million lx · sec or more is required. Japanese Unexamined Patent Publication No. 57-116330 requires the irradiation of the first erasing light of at least 500,000 lx · sec or more, preferably 3 to 9 million l.
There is a description that exposure of erasing light for x · second is necessary.
The exposure of such a large amount of erasing light increases the size of the device, increases the temperature inside the device, deteriorates the stimulable phosphor panel, increases energy costs, and installs a cooling device to prevent heat generation. There were various adverse effects such as an increase in size.

It is an object of the present invention to provide a method for efficiently eliminating residual noise of a stimulable phosphor panel in a radiation image reading system using the stimulable phosphor panel.

Another object of the present invention is to provide a residual noise erasing device for efficiently erasing the residual noise of the stimulable phosphor by using the above method.

Efficient erasing or high extinction efficiency means that the residual noise is less when the irradiation light amount of the erasing light is the same, or the irradiation light amount of the erasing light required to make the same residual noise amount. Less is called higher extinction efficiency.

[0010]

In order to achieve the above object, the method of eliminating noise of a stimulable phosphor panel of the present invention stores and records radiation image information in the stimulable phosphor panel and then irradiates excitation light. Then, the stimulated emission is caused to occur, the stimulated emission light is photoelectrically read, and then the stimulable phosphor panel is irradiated with erasing light to erase the remaining radiation image information. In the method for removing residual noise, the erasing light is irradiated a plurality of times and the irradiation of the irradiation light is performed.
By irradiating at intervals of 3 seconds to 5 minutes, the residual noise caused by the radiation image information is erased up to the next allowable reading range.

[0011] The ratio of the plurality of first light quantity of second or later with respect to the irradiation light amount of the erasing light is 1: 5 to 4: It is not preferable 1.

The stimulable phosphor of the stimulable phosphor panel is preferably a stimulable phosphor represented by the following general formula [I].

General formula [I] MX.aM'X'.bM "X": cA [wherein M is at least one of Li, Na, K, Rb and Cs, M'is Be, Mg, Ca, Sr, Ba, Z
At least one of n, Cd, Cu and Ni, M ″ is Sc, Y, La, Ce, Pr, Nd, Pm, Sm, E
u, Gd, Tb, Dy, Ho, Er, Tm, Yb, L
at least one of u, Al, Ga and In, X,
X'and X "are at least one of F, Cl, Br and I, and A is Eu, Tb, Ce, Tm, Dy, Pr, H.
o, Nd, Yb, Er, Gd, Lu, Sm, Y, Tl,
At least one of Na, Ag, Cu, and Mg. Also, a is 0 ≦ a <0.5, b is 0 ≦ b <0.5, and c is 0 <
It is a numerical value in the range of c ≦ 0.2. In the general formula [I], a matrix containing MX, M′X ′ and M ″ X ″ in a molar ratio of 1: a: b is added with A in a molar ratio of 1: c. The activated phosphor is shown.

Further, the noise erasing device for the stimulable phosphor panel of the present invention irradiates the erasable light to the stimulable phosphor panel in which radiation image information is stored, and then excitation light is irradiated to cause stimulated emission. Controlling the erasing light source device and the erasing light source device to irradiate the erasing light onto the stimulable phosphor panel a plurality of times , and the irradiation interval of the irradiating light is from 3 seconds to 5 seconds.
And an erasing control device for erasing the residual noise caused by the radiation image information up to the next allowable reading range.

It is preferable that the ratio of the second and subsequent irradiation light amounts of the erase light of the plurality of times to the first irradiation light amount is in the range of 1: 5 to 4: 1.

[0016]

The stimulable phosphor of the stimulable phosphor panel is preferably a stimulable phosphor represented by the following general formula [I].

General formula [I] MX.aM'X'.bM "X": cA [wherein M is at least one of Li, Na, K, Rb and Cs, M'is Be, Mg, Ca, Sr, Ba, Z
At least one of n, Cd, Cu and Ni, M ″ is Sc, Y, La, Ce, Pr, Nd, Pm, Sm, E
u, Gd, Tb, Dy, Ho, Er, Tm, Yb, L
at least one of u, Al, Ga and In, X,
X'and X "are at least one of F, Cl, Br and I, and A is Eu, Tb, Ce, Tm, Dy, Pr, H.
o, Nd, Yb, Er, Gd, Lu, Sm, Y, Tl,
At least one of Na, Ag, Cu, and Mg. Also, a is 0 ≦ a <0.5, b is 0 ≦ b <0.5, and c is 0 <
It is a numerical value in the range of c ≦ 0.2. ] It should be noted that the irradiation with the erasing light plural times means that at any position of the stimulable phosphor panel,
When the illuminance of the erasing light irradiated there changes with time, and there is one or more troughs of the temporal change of the illuminance, it is said that the erasing light is irradiated multiple times.

The definition of the valley is as follows.

Assuming that the temporal change S (t) of the illuminance is as shown in FIG. 1A, first, the time differential value dS (t) / S (t) /
A point where dt changes from a positive value to a negative value is a peak candidate point (P), and a point where dt changes from a negative value to a positive value is a valley candidate point (V). Two peak candidate points (P) that sandwich V are as follows. A valley is defined when the equation (1) is satisfied. If the equation (1) is not satisfied, V is not a valley and the peak candidate point used as P ′ is removed from the peak candidate points.

V / P ′ ≦ 0.5 (1) (where P ′ is the smaller of the two peak candidate points) In the case of FIG. 1 (a) V ₁ / P ₁ > 0.5 Therefore, V ₁ is not a valley, and P ₁ is excluded from the peak candidate points.

In the following, the judgments of V ₁ , V ₂ and V ₃ are made. V ₂
Is V ₂ / P ₃ > 0.5, V ₂ is not a valley, and P ₃ is excluded from the peak candidate points. V ₃ is V ₃ / P ₄ ≦ 0.5, and V _3
3 is a valley. Note (1) did not use the P ₃ as the denominator of the equation, the determination of V ₂ in order to P ₃ is deviated from the candidate point,
The peak candidate points sandwiching V ₃ are called P ₂ and P ₄ .
Similarly, V ₄ is V ₄ / P ₄ ≦ 0.5, and V ₄ is a valley.

From the above, in the case of FIG.
_3, the two valleys of V ₄ is present three times irradiation.

The illuminance change S (t) with time is shown in FIG. 1 (b).
If there is a part of dS (t) / dt = 0 like
If there is a peak candidate point when / dt changes from positive to 0 and from 0 to negative, then dS (t) / dt is from negative to 0, and 0
It is assumed that there is a valley candidate point when it changes positively from, and the peak candidate point and the valley candidate point are midpoints in the range of dS (t) / dt = 0.

Further, the irradiation light quantity of each irradiation is an integrated value of the light quantity of the light irradiated between the valleys. In the case of FIG. 1, the irradiation light amount of each irradiation is

[0026]

[Equation 1]

[0027] Further, the interval of each irradiation means a peak-to-peak interval of each irradiation intensity.

Irradiation a plurality of times means two or more times,
It is preferably twice or more and less than 100 times.

The stimulable phosphor panel for recording radiation image information according to the present invention will be hereinafter referred to as a panel, for example, and includes a plate-shaped one or a sheet-shaped one.

The erasing light is excitation light for emitting the radiation image information accumulated in the stimulable phosphor panel as fluorescence, that is, light containing at least part of the wavelength of the excitation spectrum.

To erase to the next reading permissible range, the amount of light emission by which the above-mentioned residual noise is stimulated by irradiation of excitation light at the next reading is accumulated and recorded in the stimulable phosphor panel at the next photographing. Compared with the amount of stimulated emission based on the radiation image information,
It means that residual noise is eliminated until it becomes 10 ^-3 to 10 ^-4 or less.

[0032]

By erasing the erasing light a plurality of times, the residual noise can be erased up to the next reading allowable range with a small irradiation light amount, and the residual noise can be erased efficiently.

[0033]

EXAMPLES Specific examples of the present invention will be described below, but the present invention is not limited thereto.

Embodiment 1 FIG. 2 is a schematic configuration view showing an embodiment of an apparatus in which the noise erasing device for the stimulable phosphor panel of the present invention is incorporated in a radiation image reading device.

In FIG. 2, 11 is a radiation generator, 12 is a subject, 13 is a stimulable phosphor panel containing RbBr: Tl stimulable phosphor, and 14 is excitation for emitting accumulated radiation energy as fluorescence. A light source, 15 is a photoelectric converter for detecting the fluorescence emitted from the stimulable phosphor panel, 16
Is a device for reproducing the photoelectric conversion signal detected by the photoelectric converter 15 as an image, 17 is a device for displaying the reproduced image, 18
Is a filter for cutting excitation light and transmitting only stimulated emission emitted from the stimulable phosphor panel. still,
Although FIG. 2 shows an example of obtaining a radiation image of a subject, when the subject 12 itself emits radiation, the radiation generator 11 is not particularly necessary. Further, the photoelectric converter 15 and the subsequent elements are not limited to the above as long as the optical information from the panel 13 can be reproduced as an image in some form.

Reference numeral 20 denotes an erasing light source for irradiating the stimulable phosphor panel with erasing light. A plurality of rod-shaped 150 W halogen lamps are arranged in a direction perpendicular to the longitudinal direction of the lamp, and the entire surface of the stimulable phosphor panel 13 is arranged. Illumination of 40,000 lx with uniform erasing light
It is configured to be irradiated with.

A radiation generator 11 is attached to the stimulable phosphor panel 13.
After irradiating the X-ray generated by, to record and store the radiation energy, the excitation light from the excitation light source 14 is irradiated to cause stimulated emission, and the stimulated emission light is photoelectrically converted by the photoelectric converter 15, The reproduction device 16 reads the radiation image.

Immediately after reading, the erasing light source 20 irradiates the erasing light twice under the control of the erasing controller 31. As a method of irradiating twice, for example, erasing light is first irradiated for 3 seconds, erasing of erasing light is stopped for τ seconds, and then erasing light is irradiated for 3 seconds.

Table 1 and FIG. 3 show the afterimage amount when erasing is performed by changing τ by the above apparatus. What is the afterimage amount?
The stimulable phosphor panel immediately after the irradiation of the erase light a plurality of times,
It is a value obtained by dividing the radiation image signal when the reading is performed again without irradiating the radiation by the radiation image signal that is read first, and shows how much the residual noise is reduced by the irradiation of the erasing light. Note that τ of 0 second means that the erase light is continuously irradiated.

[0040]

[Table 1]

As can be seen from Table 1 and FIG. 3, although the same amount of light is irradiated, the amount of afterimage is significantly reduced when the light is divided and irradiated at intervals of irradiation rather than continuous irradiation. I understand that

For example, the afterimage amount is reduced to 0 using the erasing light source.
When it was set to 5 × 10 ^-4 or less, 1.2 million lx · sec of light was required for continuous irradiation, but if the irradiation was divided into two times as described above and the irradiation interval was 120 seconds or more, it was 24 This can be achieved with a light intensity of 10,000 lx · sec, and the light intensity for erasing can be reduced to 1/5. As a result, the power consumption for erasing is 1 /
In addition, the amount of heat generated from the lamp is reduced to 1/5, the temperature rise of the device and the stimulable phosphor panel is reduced, and the service life of the device and the stimulable phosphor panel is improved. Also, the means for cooling them can be downsized, and the device can be downsized and the cost can be reduced.

Further, from FIG. 3, even if the irradiation interval is 300 seconds or more, there is no further improvement in the erasing efficiency, and if the irradiation interval is more than 300 seconds, the time required for erasing is unnecessarily extended, and the irradiation interval is 300. It is preferably within seconds. Further, since the effect is small even if the irradiation interval is too short, the irradiation interval is preferably 3 seconds or more. By the above,
The irradiation interval is preferably 3 seconds or more and 5 minutes or less. More preferably, it is 10 seconds or more and 3 minutes or less.

Next, with the same apparatus and method as described above, the amount of afterimage when the erasing light was irradiated in three times was examined. The method of irradiation three times was performed under the conditions of irradiation for 2 seconds, OFF for 30 seconds, irradiation for 2 seconds, irradiation for 30 seconds, and irradiation for 2 seconds. The total irradiation light amount is 240,000 lx.sec., Which is the same as the above experiment. The results are shown in Table 2.
Shown in.

[0045]

[Table 2]

It can be seen from Table 2 that the erasing efficiency is improved by dividing into 3 times as compared with the continuous irradiation. In this way, by erasing the erasing light a plurality of times, the erasing efficiency can be significantly improved.

Next, the amount of afterimage when the ratio of the irradiation light amounts of the two irradiations was changed was examined using the same apparatus and method as above. The irradiation conditions, the amount of irradiation light for the first time / the amount of irradiation light for the second time, and the amount of afterimage are shown in Table 3 and FIG. The total irradiation light amount was 240,000 lx · sec under any irradiation condition.

[0048]

[Table 3]

As can be seen from Table 3 and FIG. 4, the ratio of the irradiation light amount at the first time and the irradiation light amount at the second time is preferably between 1: 5 and 4: 1, and the ratio of the irradiation light amount deviates from the range. Then, the effect of multiple irradiation becomes low. From the above, the ratio of the irradiation light amount of the first irradiation and the irradiation light amount of the second irradiation of the plural irradiations is 1: 5.
~ 4: 1 is preferred.

Next, the amount of afterimage was examined by changing the irradiation method of twice irradiation with the same apparatus and method as above. The irradiation was performed twice so that the time change of the erasing light irradiation would be the two time changes shown in FIG. (A) is 3 seconds irradiation-60 seconds OFF-3 seconds irradiation, and (b) changes the voltage applied to the halogen lamp so that the illuminance of the erasing light on the stimulable phosphor panel changes continuously. It is the one. The total irradiation light amount was set to 240,000 lx · sec.
Table 4 shows the afterimage amount under each irradiation condition.

[0051]

[Table 4]

From Table 4, it can be seen that the erasing efficiency is improved even if the valley of the temporal change in the illuminance of the erasing light is not completely zero.

The stimulable phosphor used in the present invention is not particularly limited, but from the practical point of view, it preferably emits light by excitation light of 500 nm or more and is erasable by similar erasing light. Examples of the stimulable phosphor include BaSO ₄ : AX described in JP-A-48-80489 and S described in JP-A-48-80489.
rSO ₄ : AX, LiBO ₇ : C of JP-A-53-392775
u, Ag, etc. Others Li ₂ B ₄ O ₇ : Cu, Ag, Li ₂
o · (B ₂ O ₂ ) x: Cu and Cu, Ag, SrS: C
e, Sm, SrS: Eu, Sm, La ₂ O ₂ S: Eu, S
m, (Zn, Cd) S : Mn, ZnS: Cu, Pb, general formula BaO · xAl ₂ o _3: barium aluminate phosphor represented by Eu, general formula M ¹¹ O · xSiO _2: represented by A Alkaline earth metal silicate phosphor, general formula [I] MX
-AM'X'-bM "X": an alkali halide phosphor represented by cA. From the viewpoint of the sensitivity of the stimulable phosphor to radiation and the efficiency of erasing residual noise by the erasing method according to the present invention, the alkali halide stimulable phosphor represented by the general formula [I] is particularly preferable.

As the light source used for the erasing light, a tungsten lamp, a fluorescent lamp, a sodium lamp, a xenon discharge lamp or the like can be used.

The shape of the light source may be a point light source, a rod-shaped light source or a planar light source, and the irradiation light method may be a method of irradiating the entire surface of the stimulable phosphor with light.
Alternatively, a method of scanning the surface of the stimulable phosphor panel with light may be used.

Embodiment 2 FIG. 6 shows an embodiment in which the noise erasing device for a stimulable phosphor panel of the present invention, in which the positional relationship between the erasing light source and the stimulable phosphor panel is fixed, is incorporated in a radiation image reading device. is there.

Radiation is generated by the radiation generator 11, and radiation image information of the subject 12 is accumulated and recorded in the panel 13. Thereafter, the excitation light scanning device 14A scans the excitation light on the panel, and the stimulated emission light emitted by the irradiation of the excitation light is collected by the condenser 21 and transmitted to the photoelectric converter 15 through the excitation light cut filter 18. The signal converted into an electric signal by the photoelectric converter is constructed as radiation image information by the image reproducing device 16. This image information may be displayed by the image display device 17 or may be recorded by the image information recording device 19.

The erasing light source 20 is a light source in which a plurality of rod-shaped halogen lamps are arranged so that the entire stimulable phosphor panel 13 can be irradiated substantially uniformly at 40,000 lx. After the reading is completed, the system controller 40 controls the erasing control device 31, and the erasing control device 31 controls the erasing light source 20 to be turned on for 3 seconds, then turned off for 60 seconds, and turned on again for 3 seconds to erase the residual noise. To do.

Embodiment 3 FIG. 7 shows an embodiment in which the noise erasing device of the stimulable phosphor panel of the present invention in which the erasing light source 20 and the stimulable phosphor panel 13 move relative to each other is incorporated into a radiation image reading device. It is a schematic configuration diagram showing. In FIG. 7, the stimulable phosphor panel 13 is fixed and the erasing light source is moved. The erasing light source 20 is two rod-shaped light sources in which the lamps are separated from each other by 30 cm. Under each lamp, the lengthwise direction of the lamp is approximately 40,000 l.
An illuminance of x is obtained, and the lights of the two lamps are arranged so as not to overlap. After the reading operation is completed under the control of the system controller 40, the system controller 40
Control the erasing control device 31, and further the erasing control device 31 controls the erasing light source and the movement control device to turn on the two lamps. From the position where the lamp A is located at the upper end of the panel, two lamps are directed downward. Move the lamp at a speed of 1 cm / sec. As a result, it is possible to effectively eliminate the residual noise by performing the irradiation twice with the irradiation interval of 30 seconds.

Further, as an example in which the light source 20 and the stimulable phosphor panel 13 move relative to each other to perform irradiation a plurality of times, FIG.
The panel may be fixed as in (a), and the scanning may be repeated a plurality of times with one rod-shaped light source.

Embodiment 4 FIG. 8 shows an embodiment in which the noise erasing device of the present invention is incorporated into a radiation image reading device in which a sheet-shaped stimulable phosphor panel 13 is conveyed and circulated in the device.

FIG. 8 shows a radiation-accumulating phosphor panel.
Although the imaging unit for irradiating 13 is not shown, this imaging unit may be inside the radiation image reading device, or the stimulable phosphor panel 13 is put in a cassette or the like, and imaging is performed outside the device. The stimulable phosphor panel 13 may be inserted into a radiation image reading device to read and erase.

The erasing light source 20 is two rod-shaped light sources in which the lamps are separated from each other by 30 cm. Under each lamp, the illuminance of 40,000 lx is obtained in the length direction of the lamp, and the illuminance of the two lamps is almost uniform. The lights of the lamps are arranged so that they do not overlap each other.
After the reading operation is completed under the control of the system controller 40, the system controller 40 erases the data.
31 and the erasing control device controls the erasing light source and the conveyance control device to convey the panel 13 from the reading position to the erasing start position, turn on the two lamps, and move the panel.
It is conveyed at a speed of 1 cm / sec and erased.

As a result, the irradiation is performed twice with the irradiation interval of 30 seconds, and the residual noise can be efficiently erased.

In FIG. 8, the erasing light source may be one that irradiates the entire surface of the stimulable phosphor panel with erasing light. In that case, the stimulable phosphor panel 13 that has been read is moved from the reading position to the erasing light source. Phosphor panel that transports to the bottom
It is also possible to irradiate the erasing light with 13 fixed, and then convey the erasing light to the position below the next erasing light source to fix the stimulable phosphor panel 13 to irradiate the erasing light.

Further, if there is one erasing light source, the light source is turned ON / O.
Irradiation may be performed multiple times by the FF.

[0067]

EFFECTS OF THE INVENTION The residual noise remaining in the stimulable phosphor panel is efficiently emitted by erasing the erasing light a plurality of times to save power, reduce the size of the device, and suppress an increase in temperature inside the device. The effect of improving the durability of the equipment and the phosphor panel can be obtained.

[Brief description of drawings]

FIG. 1 is a view showing a relationship between illuminance and time in erasing light irradiation.

FIG. 2 is a schematic configuration diagram showing a first embodiment of the radiation image reading apparatus of the present invention.

FIG. 3 is a diagram showing erasing characteristics according to an erasing light exposure interval of the present invention.

FIG. 4 is a diagram showing erasing characteristics when the light amount ratio of the erasing light of the present invention is changed.

FIG. 5 is a diagram showing the relationship between the illuminance time and the amount of afterimage when the irradiation of the erasing light of the present invention is changed.

FIG. 6 is a schematic configuration diagram showing a second embodiment of the radiation image reading apparatus of the present invention.

FIG. 7 is a schematic configuration diagram showing a third embodiment of the radiation image reading apparatus of the present invention.

FIG. 8 is a schematic configuration diagram showing a radiation image reading apparatus according to a fourth embodiment of the present invention.

FIG. 9 is a perspective view of an erasing light irradiation device of the present invention.

[Explanation of symbols]

11 Radiation generator 12 subject 13 Storage phosphor panel 14 Excitation light source 14A Excitation light scanning device 15 Photoelectric converter 16 Image playback device 17 Image display device 18 filters 20 Erase light source 21 light collector 31 Erase controller 33 Movement control device 34 Erase light source moving device 40 system controller

Continuation of the front page (56) Reference JP 57-116300 (JP, A) JP 62-201398 (JP, A) JP 4-156533 (JP, A) JP 2-268299 (JP , A) JP-A-58-200231 (JP, A) JP-A-61-208361 (JP, A) JP-A-61-206361 (JP, A) JP-A-58-80633 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) G21K 4/00

Claims (6)

(57) [Claims] 1. A stimulable phosphor panel is produced by recording and recording radiation image information in a stimulable phosphor panel, and then stimulating light is irradiated to cause stimulated luminescence. In a method of removing residual noise of a stimulable phosphor panel, which comprises irradiating a body panel with erasing light and erasing the remaining radiation image information, irradiating the erasing light a plurality of times and
The residual noise of the stimulable phosphor panel is characterized in that the residual noise caused by the radiation image information is erased to the next permissible reading range by irradiating in the range of 3 seconds to 5 minutes between the irradiation of the emitted light. Erase method. 2. The amount of the erasing light for the first irradiation light amount is 2
The residual noise erasing method for a stimulable phosphor panel according to claim 1, wherein the ratio of the irradiation light amount after the second irradiation is in the range of 1: 5 to 4: 1. 3. The stimulable phosphor panel has the following general formula:
The stimulable phosphor represented by [I] is contained in the composition according to claim 1 or 2.
A method for eliminating residual noise in a stimulable phosphor panel as described above. General formula [I] MX.aM'X'.bM "X": cA [In the formula, M is a small amount of Li, Na, K, Rb and Cs.
At least one, M'is Be, Mg, Ca, Sr, Ba, Z
At least one of n, Cd, Cu and Ni, M ″ is
Sc, Y, La, Ce, Pr, Nd, Pm, Sm, E
u, Gd, Tb, Dy, Ho, Er, Tm, Yb, L
at least one of u, Al, Ga and In, X,
X'and X "are at least one of F, Cl, Br and I.
1 type, A is Eu, Tb, Ce, Tm, Dy, Pr, H
o, Nd, Yb, Er, Gd, Lu, Sm, Y, Tl,
At least one of Na, Ag, Cu and Mg
It Also, a is 0 ≦ a <0.5, b is 0 ≦ b <0.5, and c is 0 <
It is a numerical value in the range of c ≦ 0.2. ] 4. Accumulation of radiation image information, followed by excitation light
Stimulable phosphor panel that is irradiated with light to cause stimulated emission
An erasing light source device for irradiating erasing light, and the erasing light source device.
The erasing light on the stimulable phosphor panel by controlling
For several times, and the irradiation interval of the irradiation light is 3 seconds to 5 seconds.
Irradiation in the range of
Erasure control that erases existing noise to the next reading allowable range
Storage phosphor panel characterized by comprising:
Residual noise canceller. 5. The amount of erasing light with respect to the first irradiation light amount is 2.
The ratio of the amount of irradiation light after the first time is in the range of 1: 5 to 4: 1.
The residual noise elimination of the stimulable phosphor panel according to claim 4.
Leaving device. 6. The stimulable phosphor panel has the following general formula:
6. A storage phosphor containing the stimulable phosphor of [I].
2. A residual noise canceling device for a stimulable phosphor panel as described in 1. General formula [I] MX.aM'X'.bM "X": cA [In the formula, M is a small amount of Li, Na, K, Rb and Cs.
At least one, M'is Be, Mg, Ca, Sr, Ba, Z
At least one of n, Cd, Cu and Ni, M ″ is
Sc, Y, La, Ce, Pr, Nd, Pm, Sm, E
u, Gd, Tb, Dy, Ho, Er, Tm, Yb, L
at least one of u, Al, Ga and In, X,
X'and X "are at least one of F, Cl, Br and I.
1 type, A is Eu, Tb, Ce, Tm, Dy, Pr, H
o, Nd, Yb, Er, Gd, Lu, Sm, Y, Tl,
At least one of Na, Ag, Cu and Mg
It Also, a is 0 ≦ a <0.5, b is 0 ≦ b <0.5, and c is 0 <
It is a numerical value in the range of c ≦ 0.2. ]