FUNDAMENTAL STUDIES ON MEDICAL RADIOISOTOPE SCANNING. I. SENSITIVITY AND RESOLUTION OF COLLIMATORS

Journal Article · Sun Jan 01 04:00:00 EST 1961 · Nippon Igaku Hoshasen Gakkai Zasshi (Japan)

OSTI ID:4837676

Kakehi, H; Arimizu, N; Nakano, M

Iso-response curves were made wit a I/sup 131/ point source and with various collimators such as cylindrical cone, inverted tapered cone, or 2-inch honey one. The NaI crystal was 2 inches in diameter and 2 inches in height. As a rule, the shapes of iso-response curves in human tissues were a little shortened in the axial direction of the hole of the collimator as compared with those in air. In calculating the areas of curves of more than l0% response, there was little difference between differential and integral computation, but with less than 5% response integral computation gave a much larger area than differential. From the half maximum heights on the sxis of the collimator at a centain distance, resolution curves were constructed both in air and in material equivalent to tissue and there was no noticeable difference between integral and differential calculation. Therefore, the resolution of the collimator is influenced only by its own geometrical properties and not by scattered rays. (auth)

• Research Organization: Chiba Univ. School of Medicine, Japan
• NSA Number: NSA-16-022353
• OSTI ID: 4837676
• Journal Information: Nippon Igaku Hoshasen Gakkai Zasshi (Japan), Journal Name: Nippon Igaku Hoshasen Gakkai Zasshi (Japan) Vol. Vol: 20; ISSN NHGZA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

AIR
CONFIGURATION
CRYSTALS
CYLINDERS
ENGINEERING AND EQUIPMENT
IODINE 131
MEDICINE
RADIATION SOURCES
RADIOISOTOPES
RESOLUTION
SCATTERING
SENSITIVITY
SODIUM IODIDES
TISSUES