KIDNEY VOLUME ESTIMATION USING TC-99M-DMSA-RSPECT - EVALUATION BY PHANTOM STUDY

Renal parenchymal volume is important for clinical interpretation. The phantom study was carried out to validate the volume calculation. The volume of kidney phantom was determined using reoriented single photo n emission computed tomography (RSPECT). The phantom volume range was 20-300 ml. There are two major factors in the determination of volume which are radioactivity concentration and organ/background ratio. Our results showed that the effect of radioactivity concentration on the v olume in the kidney phantom is -3.3 to 7.5% whereas the effect of orga n/background ration was only 2.2%. Our relative volume deviation, ther efore, from the real volume was 1.43%. We concluded that it is feasibl e to use kidney volume in clinical work.