RT Journal Article
SR Electronic
T1 Background Correction and Measurement of Injected Activity in Quantification of Renal Function
JF Journal of Nuclear Medicine Technology
JO J. Nucl. Med. Technol.
FD Society of Nuclear Medicine
SP 211
OP 217
VO 21
IS 4
A1 Jorge, J. A. Pires
A1 Delaloye, A. Bischof
A1 Delaloye, B.
YR 1993
UL http://tech.snmjournals.org/content/21/4/211.abstract
AB We have compared four regions of interest frequently used for kidney background correction during renography: left and right circular (C), semilunar (S), below (I), and between both kidneys (B), in patients with four types of kidneys: bilateral normal, bilateral subnormal, bilateral abnormal, and left abnormal/right subnormal. C and S give similar results, I overestimates the function of both kidneys, and B overestimates right kidney function because of the lack of liver activity correction. To test measurements of injected activity, we measured pre- and postinjection activity in the syringe at the collimator surface, with and without depth correction, in a syringe holder at 24 cm from the collimator, and in a phantom containing a known activity, immersed in water and separated from the collimator surface by perspex plates at a distance representing kidney depth. We found a high correlation between the phantom and syringe methods: the phantom, however, most closely approaches the in vivo situation.