Volume and landmark analysis: comparison of MRI measurements obtained with an endorectal coil and with a phased-array coil. Issue 4 (April 2015)

• Record Type: Journal Article
• Authors: Mazaheri, Y.; Afaq, A.A.; Jung, S.I.; Goldman, D.A.; Wang, L.; Aslan, H.; Zelefsky, M.J.; Akin, O.; Hricak, H.
• Is Part Of: Clinical radiology. Volume 70:Issue 4(2015)
• Page Start: 379
• Page End: 386
• Publication Date: 2015-04
• Subjects: Medical radiology -- Periodicals; Radiotherapy -- Periodicals; Radiotherapy -- Periodicals; Radiology -- Periodicals; Societies, Medical -- Periodicals; Medical radiology; Radiotherapy; Electronic journals; Periodicals; 616.0757
• DOI: 10.1016/j.crad.2014.12.002
• Languages: English
• ISSNs: 0009-9260

Abstract

<abstract xml:lang="en" abstract-type="author" id="abs0010"> <title> <x xml:space="preserve">Abstract</x> </title> <sec> <title id="sectitle0010">Aim</title> <p id="abspara0010">To 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).</p> </sec> <sec> <title id="sectitle0015">Materials and methods</title> <p id="abspara0015">Informed 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 (<italic>n</italic> = 3) or 3 T (<italic>n</italic> = 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).</p> </sec> <sec> <title id="sectitle0020">Results</title> <p id="abspara0020">Differences in prostate volume between PAC-MRI and ERC-MRI [median: −0.75 mm<sup>3</sup> (<italic>p</italic> = 0.10) and median: −0.84 mm<sup>3</sup> (<italic>p</italic> = 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 (<italic>p</italic> ≤ 0.0005). Distances were larger on PAC-MRI (<italic>p</italic> ≤ 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).</p> </sec> <sec> <title id="sectitle0025">Conclusion</title> <p id="abspara0025">Measurements of distances between anatomical landmarks differed significantly between ERC-MRI and PAC-MRI, although prostate volume measurements did not.</p> </sec> </abstract>