GB1521084A - Evaluation circuitry for an x-ray apparatus - Google Patents

Evaluation circuitry for an x-ray apparatus

Info

Publication number
GB1521084A
GB1521084A GB3362375A GB3362375A GB1521084A GB 1521084 A GB1521084 A GB 1521084A GB 3362375 A GB3362375 A GB 3362375A GB 3362375 A GB3362375 A GB 3362375A GB 1521084 A GB1521084 A GB 1521084A
Authority
GB
United Kingdom
Prior art keywords
log
give
produces
ray
stage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3362375A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to US05/751,204 priority Critical patent/US4065397A/en
Publication of GB1521084A publication Critical patent/GB1521084A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G01N23/06—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption
    • G01N23/083—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption the radiation being X-rays
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/03—Computed tomography [CT]
    • A61B6/032—Transmission computed tomography [CT]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/40—Arrangements for generating radiation specially adapted for radiation diagnosis
    • A61B6/4064—Arrangements for generating radiation specially adapted for radiation diagnosis specially adapted for producing a particular type of beam
    • A61B6/4071—Pencil beams
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/48—Diagnostic techniques
    • A61B6/482—Diagnostic techniques involving multiple energy imaging

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Medical Informatics (AREA)
  • General Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Pathology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Public Health (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Optics & Photonics (AREA)
  • Biophysics (AREA)
  • Radiology & Medical Imaging (AREA)
  • Biomedical Technology (AREA)
  • Veterinary Medicine (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Pulmonology (AREA)
  • Theoretical Computer Science (AREA)
  • Toxicology (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Apparatus For Radiation Diagnosis (AREA)

Abstract

1521084 X-ray absorption analysis SIEMENS AG 12 Aug 1975 [9 Dec 1974] 33623/75 Heading G1A [ Also in Division H4] In evaluation circuitry for an x-ray apparatus, an upstream signal I 0 from an amplifier 11 and a downstream signal I from an amplifier 8 are processed to give -y = log I 0 /I, from which a correction factor C is generated according to: C = 1 + - y( - y - - y 1 )(A 0 + A 1- y) for O#y#-y 1 , or 1 + (-y - -y 1 )(B 0 + B 1- y + B 2- y<SP>2</SP>) for -y 1 #-y#10, where, for an x-ray beam characterized by a normalizing spectral line at 51 KeV, the constants would have these values: - y 1 = 4À45; A 0 = -0À035; A 1 = 0À0039; B 0 =-0À04; B 1 = -0À0126; B 2 = 0À00075. The ratio I/I 0 is then multiplied by C to give a corrected measure of the object density. An x-ray tube 1 having e.g. an anode voltage of 100KV, produces a polychromatic beam 4 of x-rays for transversely scanning a layer of an object 5, the beam 4 being rotatable, between scans, about an axis perpendicularly intersecting the scanning plane at a point 7 in the middle of the scan. The ratio of upstream to downstream intensities detected by respective detectors 10, 3, should ideally be an exponential function of the mass of material in the beam path; but for polychromatic radiation, differential absorbence characteristics of the test object 5 give rise to errors by reason of spectral hardening of the beam in its passage through the object, for which the correction factor C must be applied. The product CI, formed in a multiplier 15, is divided by I 0 at 9 and further processed by known methods to give a layer-image TV display at 12. Alternatively, Fig. 3 (not shown) a log quotient stage (16) produces -y = log I 0 /I and a function forming stage (18) produces a transformed log correction C<SP>1</SP> for adding to -y in a stage (17).
GB3362375A 1974-12-09 1975-08-12 Evaluation circuitry for an x-ray apparatus Expired GB1521084A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US05/751,204 US4065397A (en) 1974-12-09 1976-12-16 Planigraphic X-ray apparatus for the preparation of tomographic images

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19742458225 DE2458225A1 (en) 1974-12-09 1974-12-09 ROENTGEN LAYER FOR THE PRODUCTION OF TRANSVERSAL LAYER IMAGES

Publications (1)

Publication Number Publication Date
GB1521084A true GB1521084A (en) 1978-08-09

Family

ID=5932969

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3362375A Expired GB1521084A (en) 1974-12-09 1975-08-12 Evaluation circuitry for an x-ray apparatus

Country Status (4)

Country Link
BE (1) BE836321A (en)
DE (1) DE2458225A1 (en)
FR (1) FR2294456A1 (en)
GB (1) GB1521084A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2148496A (en) * 1983-10-21 1985-05-30 Steelastic Co Measuring transmittance of a material

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7704119A (en) * 1976-04-19 1977-10-21 Varian Associates TOMOGRAPHIC SCANNING DEVICE.
DE2815347A1 (en) * 1978-04-10 1979-10-18 Philips Patentverwaltung METHOD FOR DETERMINING THE DISTRIBUTION OF THE ABSORPTION OF RADIATION IN A PLANE EXAMINATION AREA
DE2831038C2 (en) * 1978-07-14 1982-07-01 Siemens AG, 1000 Berlin und 8000 München Radiation diagnostic device for the generation of slice images
DE2919810C2 (en) * 1979-05-16 1983-03-24 Siemens AG, 1000 Berlin und 8000 München Radiation diagnostic device for the generation of slice images
FR2496934A1 (en) * 1980-12-18 1982-06-25 Thomson Csf Axial transverse X=ray tomographic scanner with digital filter - uses X=ray source rotated round body to produce views of transverse section from discrete sequence produced from detector array
FR2519772B1 (en) * 1982-01-08 1986-01-31 Thomson Csf REFERENCE DETECTION DEVICE FOR MULTIDETECTOR TOMODENSITOMETER AND TOMODENSITOMETER COMPRISING SUCH A DEVICE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2148496A (en) * 1983-10-21 1985-05-30 Steelastic Co Measuring transmittance of a material

Also Published As

Publication number Publication date
DE2458225A1 (en) 1976-06-16
BE836321A (en) 1976-04-01
FR2294456B1 (en) 1977-12-16
FR2294456A1 (en) 1976-07-09

Similar Documents

Publication Publication Date Title
Gorenstein et al. The analysis of X-ray spectra
US3927318A (en) Cross-sectional fluorescent imaging system
Schreckenbach et al. Search for mixing of heavy neutrinos in the β+ and β− spectra of the 64Cu decay
GB1466617A (en) Method and apparatus for the determination of electron density in a part volume of a body
US2488269A (en) Noncontacting thickness gauge
GB1525488A (en) Method and apparatus for spectrometric analysis of fine grained minerals and other substances using an electron bea
US4114041A (en) Radiography
Bauer et al. Computer analysis of X‐ray spectra (EDS) from thin biological specimens
Ware et al. Background corrections for quantitative electron microprobe analysis using a lithium drifted silicon X-ray detector
GB1521084A (en) Evaluation circuitry for an x-ray apparatus
US3718818A (en) Measuring cerenkov radiation produced by charged particles passing through a gas as indicative of the energy of the charged particles
GB1571800A (en) Radiography
JPS6280541A (en) Method and device for measuring optical attenuation of zone of body to be tested on which primary beam cross
Dolgih et al. X-ray fluorescent spectrometer with linear position sensitive detector
US20090228216A1 (en) Methods, a processor, and a system for improving an accuracy of identification of a substance
GB2030815A (en) Determination of internal body structures by measuring scattered radiation
Harvey et al. The energy of alpha particles from U234, U238, and Th232
WO1985004565A1 (en) Computerized tomography unit
GB1461195A (en) Method of determination of the mass and centre of gravity of an object
Keski-Rahkonen The K X-ray Fluorescence Spectrum of Neon
US3671744A (en) Digital differential emission x-ray gauge
Hudson Energy Loss and Straggling of 150-Mev Electrons in Li, Be, C, and Al
Edelsack et al. Experimental Investigation of Thick Target Bremsstrahlung Radiation Produced by Electrons of 1.00, 1.50 and 2.00 MeV
JPS6170444A (en) Concentration analyzing method in electron ray micro-analysis instrument
Heinrich et al. Quantitative electron probe microanalysis: Uncertainty in the atomic number correction

Legal Events

Date Code Title Description
CSNS Application of which complete specification have been accepted and published, but patent is not sealed