MAGNETIC-RESONANCE-IMAGING OF PROSTATE-CANCER - COMPARISON OF IMAGE QUALITY USING ENDORECTAL AND PELVIC PHASED-ARRAY COILS

Objective: To compare endorectal coil (ERC) and pelvic phased array (P PA) coil magnetic resonance imaging for delineation of the prostate gl and and seminal vesicles. To compare ERC images at different inflation volumes of the ERC air balloon. Materials and Methods: Twenty-one pat ients underwent T2-weighted examinations using PPA and ERC, The ERC ev aluations were performed at three balloon inflation volumes (60, 100 a nd 140 mi), All patients had proven prostate cancer. Images were analy sed for visibility of anatomic structures, gland distortion, tumour vi sualization, artefacts (coil flare, coil-related artefact and rectal m ovement) and overall image quality. A grading system was used for each parameter.Results: ERC assessments at increasing balloon inflations s howed equivalent anatomical detail and overall image quality, However, increasing gland distortion and decreasing coil related flare was fou nd with higher air inflations (P = 0.13 and P = 0.006, respectively). When compared with ERC images, visibility of the anterior gland and ne urovascular bundles was better with the PPA coil (P = 0.0001 and 0.002 , respectively). The overall image quality was superior with the PPA c oil (P = 0.0001), However, no significant difference in visualization of tumour or delineation of tumour extent was observed between the two techniques. Conclusions: PPA imaging of the prostate gland provides i mages of superior quality compared,vith the ERC, This is mainly due to fewer artefacts with the PPA coil and improved anterior gland visibil ity. When ERC is used, air inflation to at least 100 ml reduces coil f lare artefact.