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Fig. 2B —50-year-old woman referred for mercap-toacetyltriglycine (MAG3)
scanning because of suspected obstruction Expanded QuantEM review display
shows patient values for MAG3 clearance; residual urine volume; percent
relative uptake; and time to maximum counts (Tmax), 20-minute-to-maximum-count
ratio (20/max), half-time (T
), and postvoid to maximum
(postvoid/max) ratios for whole-kidney and cortical regions of interest as
well as normal ranges for each of these values. Expanded review page also
shows enlarged parenchymal image obtained at 2-3 minutes, enlarged display of
19- to 20-minute image, and quality control images showing preinjection and
postinjection syringe counts and time of bolus arrival in kidneys. Postvoid to
maximum count ratio of left kidney is slightly elevated at 23%, but this ratio
tells clinician that almost 80% of maximal activity has washed out of left
kidney by conclusion of study. Such high washout percentage is strong evidence
against obstruction.
