| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 3981537 | Clinical Radiology | 2015 | 8 Pages |
•Measurements of prostate geometry are compared on MRI with two coil arrangements.•Prostate volume did not differ significantly between the two coil arrangements.•Distances differed significantly between the two coil arrangements.
AimTo compare prostate volumes and distances between anatomical landmarks on MRI images obtained with a phased-array coil (PAC) only and with a PAC and an endorectal coil (ERC).Materials and methodsInformed consent was waived for this Health Insurance Portability and Accountability Act-compliant study. Fifty-nine men underwent PAC-MRI and ERC-MRI at 1.5 (n = 3) or 3 T (n = 56). On MRI images, two radiologists independently measured prostate volume and distances between the anterior rectal wall (ARW) and symphysis pubis at the level of the verumontanum; ARW and symphysis pubis at the level of the mid-symphysis pubis; and bladder neck and mid-symphysis pubis. Differences between measurements from PAC-MRI and ERC-MRI were assessed with the Wilcoxon RANK SUM test. Inter-reader agreement was assessed using the concordance correlation coefficient (CCC).ResultsDifferences in prostate volume between PAC-MRI and ERC-MRI [median: −0.75 mm3 (p = 0.10) and median: −0.84 mm3 (p = 0.06) for readers 1 and 2, respectively] were not significant. For readers 1 and 2, median differences between distances were as follows: −10.20 and −12.75 mm, respectively, ARW to symphysis pubis at the level of the verumontanum; −6.60 and −6.08 mm, respectively, ARW to symphysis pubis at the level of the mid-symphysis pubis; −3 and −3 mm respectively, bladder neck to mid-symphysis pubis. All differences in distance were significant for both readers (p ≤ 0.0005). Distances were larger on PAC-MRI (p ≤ 0.0005). Inter-reader agreement regarding prostate volume was almost perfect on PAC-MRI (CCC: 0.99; 95% CI: 0.98–1.00) and ERC-MRI (CCC: 0.99; 95% CI: 0.99–1.00); inter-reader agreement for distance measurements varied (CCCs: 0.54–0.86).ConclusionMeasurements of distances between anatomical landmarks differed significantly between ERC-MRI and PAC-MRI, although prostate volume measurements did not.
