Keywords:
Urinary Tract / Bladder, Genital / Reproductive system male, Abdomen, MR, Diagnostic procedure, Imaging sequences, Cancer
Authors:
R. O'Donohoe, R. Dunne, V. Kimbrell, C. M. Tempany-Afdhal; Boston, MA/US
DOI:
10.1594/ecr2018/C-1171
Results
Qualitative T2w image analysis
The results of the qualitative T2w image analysis are given in Table 3.
Artifact severity was greater in T2w images acquired with the endorectal coil when compared with the wearable pelvic coil (ERC 2.01 ± 0.42 vs.
WPC 1.39 ± 0.70,
p=0.003).
Motion artifact in the phase encode direction emanating from the interface of the endorectal coil and rectal wall was seen on 17 of 18 ERC T2w sequences (Figure 1).
There was no statistically significant difference in overall image quality,
posterior border definition,
zonal anatomy distinction,
neurovascular bundle visualization or seminal vesicle visualization.
Qualitative diffusion weighted image analysis
The ability to clearly distinguish the peripheral zone and transtional zone on DWI was greater on images acquired with the endorectal coil when compared with the wearable pelvic coil (ERC 4.28 ± 0.91 vs.
WPC 3.72 ± 1.02,
p < 0.001; Table 4).
ERC DWI images were also superior in clearly distinguishing the peripheral zone and transitional zone when compared with the standard pelvic phased array coil (ERC 4.28 ± 0.91 vs.
PPA 3.50 ± 0.92,
p = 0.018).
There was no significant difference in the ability of the WPC and the PPA to distinguish zonal anatomy.
There was no significant difference in gland margin demarcation,
geometric distortion,
artifact severity and overall image quality between the WPC,
PPA and ERC.
Signal to noise ratio
The T2w signal to noise ratio was significantly higher in endorectal coil images than wearable pelvic coil images (ERC 38.32 ± 15.19 vs.
WPC 16.57 ± 5.13,
p <0.001; Table 5).
Similarly,
there were significantly higher signal to noise ratios comparing the endorectal coil DWI with the wearable pelvic coil DWI (ERC 81.49 ± 32.42 vs.
WPC 19.83 ± 6.30,
p <0.001; Table 6),
and also comparing the endorectal coil DWI with the standard pelvic phased array coil DWI (ERC 81.49 ± 32.
42 vs.
PPA 22.88 ± 13.62,
p <0.001).
There was no significant difference comparing the DWI signal to noise ratio for the wearable pelvic coil and the standard pelvic phased array coil.