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Evaluating the effect of rectal distension on prostate multiparametric MRI image quality.

Abstract：

PURPOSE:To evaluate the effect of rectal distension on the quality of anatomical and functional prostate multiparametric (mp) MRI. MATERIALS AND METHODS:Multiparametric (mp) 3T-MRI images of 173 patients were independently evaluated by two radiologists in this retrospective study. Planimetry rectal volumes were derived and a subjective assessment of rectal distension was made using a 5-point Likert scale (1=no stool/gas, 5=large amount of stool/gas). Image quality of diffusion-weighted imaging (DWI) was evaluated using a 5-point Likert scale. DWI was further scored for distortion and artefact. T2W images were evaluated for image sharpness and the presence of motion artefact. The stability of the dynamic contrast-enhancement acquisition was assessed by recording the number of corrupt data points during the wash-out phase. RESULTS:There was a strong correlation between subjective scoring of rectal loading and objectively measured rectal volume (r=0.82), p<0.001. A significant correlation was shown between increased rectal distension and both reduced DW image quality (r=-0.628, p<0.001), and increased DW image distortion (r=0.814, p<0.001). There was also a significant trend for rectal distension to increase artefact at DWI (r=0.154, p=0.042). Increased rectal distension led to increased motion artefact on T2 (p=0.0096), but did not have a significant effect on T2-sharpness (p=0.0638). There was no relationship between rectal distension and DCE image quality (p=0.693). 63 patients underwent lesion-targeted biopsy post MRI, there was a trend to higher positive predictive values in patients with minor rectal distension (34/38, 89.5%) compared to those with moderate/marked distension (18/25, 72%), p=0.09. CONCLUSION:Rectal distension has a significant negative effect on the quality of both T2W and DW images. Consideration should therefore be given to bowel preparation prior to prostate mpMRI to optimise image quality.

journal_name

Eur J Radiol

journal_title

European journal of radiology

authors

Caglic I,Hansen NL,Slough RA,Patterson AJ,Barrett T

doi

10.1016/j.ejrad.2017.02.029

subject

Has Abstract

pub_date

2017-05-01 00:00:00

pages

174-180

eissn

0720-048X

issn

1872-7727

pii

S0720-048X(17)30074-8

journal_volume

pub_type

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Evaluating the effect of rectal distension on prostate multiparametric MRI image quality.