Scanning radiology with initial scan for adjusting system so that detector means operates within its preferred range
In a radiological apparatus is arranged to produce a representation of the variation of absorption of penetrating radiation over a planar, cross-sectional slice of a body under examination. The radiation emergent from the body along a number of paths is detected by detector means including one or more photomulipliers. The output signals from the photomultiplier or photomultipliers are monitored and compared with upper and lower threshold levels which represent the extremes of substantially linear operation of the photomultiplier or photomultipliers. In the event of the output signals departing from the range defined by the threshold levels a correction signal is generated and utilized to tend to restore the output signals with the range.
- Assignee:
- EMI Ltd.
- Patent Number(s):
- US 4091287
- OSTI ID:
- 6166982
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
47 OTHER INSTRUMENTATION
550600 -- Medicine
62 RADIOLOGY AND NUCLEAR MEDICINE
CALIBRATION
CONTROL SYSTEMS
CORRECTIONS
DESIGN
ELECTROMAGNETIC RADIATION
GAMMA RADIATION
GAMMA SOURCES
IONIZING RADIATIONS
MEASURING INSTRUMENTS
MEDICINE
NUCLEAR MEDICINE
OPERATION
PHOTOMULTIPLIERS
PHOTOTUBES
RADIATION DETECTORS
RADIATION SOURCES
RADIATIONS
RADIOLOGY
SCINTILLATION COUNTERS
SIGNALS
X RADIATION
X-RAY EQUIPMENT
X-RAY SOURCES