Evaluation of 2 diuretic 18fluorine-fluorodeoxyglucose positron emission tomography/computed tomography imaging protocols for intrapelvic cancer

Abstract

BACKGROUND: F-18-Fluorodeoxyglucose (FDG) positron emission tomography/computed tomography (PET/CT) plays an important part in the oncological evaluation of the abdomen and pelvis, but the interpretation and quantification is often hampered by intense physiological urinary activity. We evaluate 2 different diuretic imaging protocols by comparing intensity of urinary activity and we look at the impact of multiple vanables on the final urinary activity. METHODS: Comparative analysis of 102 patients (median age: 64) having intrapelvic carcinoma. After full body acquisition, 58 patients were administered 20 mg of furosemide 90 min post injection of FDG (P90). For 44 patients, 20 mg of furosemide was administered 30 min post injection of FDG (P30). Comparisons between groups were performed using the Mann-Whitney Test and chi(2). The BMI, creatinine, clearance, age, injected activity, diuretic protocol, gender and glycemia were evaluated with multivariate analysis for their impact on the final urinary activity. RESULTS: Concerning the comparison of the urinary activity we observe a significant difference (P=0.0029) between P90 and P30 for the SUVmax (median 4.3 [range 1.6: 17.7] vs. 6.0 [range 2.9: 15.1]), and for the SUVmax (P= 240 MBq or HMI of >= 25 and a glycemia >120 mg/dL, a significant amount of residual urinary activity remains for both protocols.