GB1328376A - X-ray apparatus - Google Patents

X-ray apparatus

Info

Publication number
GB1328376A
GB1328376A GB4183570A GB4183570A GB1328376A GB 1328376 A GB1328376 A GB 1328376A GB 4183570 A GB4183570 A GB 4183570A GB 4183570 A GB4183570 A GB 4183570A GB 1328376 A GB1328376 A GB 1328376A
Authority
GB
United Kingdom
Prior art keywords
dose
channel
measurement
levels
rate
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
GB4183570A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries Ltd
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 Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1328376A publication Critical patent/GB1328376A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05G—X-RAY TECHNIQUE
    • H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
    • H05G1/08—Electrical details
    • H05G1/26—Measuring, controlling or protecting
    • H05G1/30—Controlling
    • H05G1/38—Exposure time
    • H05G1/42—Exposure time using arrangements for switching when a predetermined dose of radiation has been applied, e.g. in which the switching instant is determined by measuring the electrical energy supplied to the tube
    • H05G1/44—Exposure time using arrangements for switching when a predetermined dose of radiation has been applied, e.g. in which the switching instant is determined by measuring the electrical energy supplied to the tube in which the switching instant is determined by measuring the amount of radiation directly

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • X-Ray Techniques (AREA)

Abstract

1328376 X-ray exposure control PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 1 Sept 1970 [2 Sept 1969] 41835/70 Heading G1A X-ray exposure control apparatus includes an ionisation chamber 20 sensing radiation passing through a body 19 being radiographed, the detector output being used both in a dose measurement channel 8, 13 by which the attainment of a predetermined dose terminates the exposure by opening switch 17 and a dose-rate measurement channel 8-12 by which the length of the exposure is also adjusted in dependence on the absorption characteristics of body 19 (i.e. fat or thin patient etc) by switching in one of a number of tappings 5-7 to alter the X-ray tube high voltage or by feedback to the integrator device 8 in which the switch-off dose is pre-set. Since the channel 8-13 includes the integrator 8, channel 8-12 includes a differentiator 9. Alternatively, the dose rate dependent detector output may feed directly to comparator circuit 10. This compares the rate with pre-settable upper and lower threshold values. These levels are pre-set in comparator 10 for a number of different organs that may be required to be radiographed, a number of voltage dividers being provided for this purpose. When the measurement is above, between or below these levels, contacts 5, 6 or 7 respectively, are used in the tube supply circuit. As an alternative, the tappings on the autotransformer 4 may be pre-set instead of the levels in 10. A thyristor may replace switches 5-7. The fact that the measurement is above or below threshold values may be indicated optically or acoustically. Adjustment of the voltage supply may be in steps.
GB4183570A 1969-09-02 1970-09-01 X-ray apparatus Expired GB1328376A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691944481 DE1944481C3 (en) 1969-09-02 1969-09-02 X-ray generator with a device for switching off an X-ray source when a switch-off dose is reached and with a control device which increases the X-ray tube voltage when the dose rate falls below a lower threshold value

Publications (1)

Publication Number Publication Date
GB1328376A true GB1328376A (en) 1973-08-30

Family

ID=5744396

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4183570A Expired GB1328376A (en) 1969-09-02 1970-09-01 X-ray apparatus

Country Status (5)

Country Link
AU (1) AU1947570A (en)
BE (1) BE755549A (en)
DE (1) DE1944481C3 (en)
FR (1) FR2060839A5 (en)
GB (1) GB1328376A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102949193A (en) * 2011-08-22 2013-03-06 上海联影医疗科技有限公司 Fluoroscopy equipment and method for reducing fluoroscopy dosage

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2550437C2 (en) * 1975-11-10 1985-03-28 Siemens AG, 1000 Berlin und 8000 München Automatic exposure device for an X-ray recorder
DE2556699A1 (en) * 1975-12-17 1977-06-23 Philips Patentverwaltung X-RAY GENERATOR WITH AUTOMATIC EXPOSURE
US4347547A (en) * 1980-05-22 1982-08-31 Siemens Medical Laboratories, Inc. Energy interlock system for a linear accelerator
US4342060A (en) * 1980-05-22 1982-07-27 Siemens Medical Laboratories, Inc. Energy interlock system for a linear accelerator
DE3132057A1 (en) * 1981-08-13 1983-03-03 Philips Patentverwaltung Gmbh, 2000 Hamburg X-RAY GENERATOR WITH AUTONOMOUS CORRECTION OF THE DOSE-DETERMINING INTAKE PARAMETERS

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1227570B (en) * 1958-05-07 1966-10-27 Siemens Reiniger Werke Ag Exposure-automated X-ray apparatus with setting means for the tube voltage and the tube current

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102949193A (en) * 2011-08-22 2013-03-06 上海联影医疗科技有限公司 Fluoroscopy equipment and method for reducing fluoroscopy dosage
CN102949193B (en) * 2011-08-22 2015-06-10 上海联影医疗科技有限公司 Fluoroscopy equipment and method for reducing fluoroscopy dosage

Also Published As

Publication number Publication date
DE1944481B2 (en) 1979-02-01
FR2060839A5 (en) 1971-06-18
AU1947570A (en) 1974-03-09
BE755549A (en) 1971-03-01
DE1944481A1 (en) 1971-03-04
DE1944481C3 (en) 1985-03-21

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee