Radiation-dose calculation for five /sup 99/mTc IDA hepatobiliary agents

Journal Article · Mon Nov 01 04:00:00 EST 1982 · J. Nucl. Med.; (United States)

OSTI ID:6492727

Brown, P H; Krishnamurthy, G T; Bobba, V R; Kingston, E; Turner, F E

The radiation absorbed doses from five commercially available hepatobiliary agents--/sup 99m/Tc-tagged analogs of IDA (EIDA, PIPIDA, HIDA, PBIDA, DISIDA) have been calculated from biokinetic data in 41 normal subjects. Serial gamma images, with blood and urine samples, were obtained to calculate cumulated radioactivity in the source organs: blood, kidney, bladder, liver, gallbladder, and intestines. The critical organ was the gallbladder, with an absorbed-dose range of 690 to 780 mrad/mCl. Absorbed doses for other target organs were: upper large intestine 320 to 370 mrad/mCi, lower large intestine 210 to 240, small intestine 170 to 200, liver 65 (DISIDA) to 130 (PBIDA), ovaries 63 to 72, and urinary bladder wall 23 (PBIDA) to 36 (EIDA). The radiation absorbed dose was largely independent of changes in chemical structure except in (a) the liver, where absorbed dose varied by a factor of two in proportion to the rate of excretion of the IDA agent from the liver, and (b) the urinary bladder, where absorbed dose varied by a factor of 1.6 because of differences in rate of excretion. When the stimulus for gallbladder emptying is changed from whole-meal ingestion to cholecystokinin injection, the absorbed dose to the gallbladder increases to approximately 1 rad/mCi; if no gallbladder emptying is assumed, its absorbed dose increases to approximately 1.9 rad/mCi. In the absence of contraindication, the gallbladder absorbed dose may thus be decreased by inducing gallbladder emptying at the end of the imaging study.

• Research Organization: Veterans Administration Medical Center, Portland, Oregon
• OSTI ID: 6492727
• Journal Information: J. Nucl. Med.; (United States), Journal Name: J. Nucl. Med.; (United States) Vol. 23:11; ISSN JNMEA
• Country of Publication: United States
• Language: English

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& Toxicology-- Man
59 BASIC BIOLOGICAL SCIENCES
62 RADIOLOGY AND NUCLEAR MEDICINE
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BILIARY TRACT
BODY
COMPARATIVE EVALUATIONS
COUNTING TECHNIQUES
DIAGNOSTIC TECHNIQUES
DIGESTIVE SYSTEM
DISTRIBUTION
DOSES
DRUGS
GLANDS
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
ISOMERIC NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LABELLED COMPOUNDS
LIVER
NUCLEI
ODD-EVEN NUCLEI
ORGANS
PATIENTS
RADIATION DOSES
RADIOISOTOPE SCANNING
RADIOISOTOPES
RADIOPHARMACEUTICALS
SCINTISCANNING
TECHNETIUM 99
TECHNETIUM ISOTOPES
TISSUE DISTRIBUTION
YEARS LIVING RADIOISOTOPES