open access

Vol 22, No 6 (2017)
Original research articles
Published online: 2017-11-01
Submitted: 2017-02-17
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Comparison of MRI sequences in ideal fiducial maker-based radiotherapy for prostate cancer

Osamu Tanaka, Hisao Komeda, Mitsuyoshi Hattori, Shigeki Hirose, Eiichi Yama, Masayuki Matsuo
DOI: 10.1016/j.rpor.2017.10.002
·
Rep Pract Oncol Radiother 2017;22(6):502-506.

open access

Vol 22, No 6 (2017)
Original research articles
Published online: 2017-11-01
Submitted: 2017-02-17

Abstract

Aim

Prostate contouring using CT alone is difficult. To overcome the uncertainty, CT/MRI registration using a fiducial marker is generally performed. However, visualization of the marker itself can be difficult with MRI. This study aimed to determine the optimal MRI pulse sequence for defining the marker as well as the prostate outline among five sequences.

Materials and methods

A total of 21 consecutive patients with prostate cancer were enrolled. Two gold fiducial markers were placed before CT/MRI examination. We used the following five sequences: T1-weighted spin-echo (T1WI; TR/TE, 400–650/8[[ce:hsp sp="0.25"/]]ms); T2-weighted fast spin-echo (T2WI; 4000/80); T2*-2D-weighted gradient echo (T2*2D; 700/18); T2*-3D-weighted gradient echo (T2*3D; TR/TE1/deltaTE, 37/14/7.3); and contrast-enhanced T1-weighted spin-echo (CE-T1WI; 400–650/8). Qualitative image analysis of the sequences was performed by three observers. These observers subjectively scored all images on a scale of 1–3 (1[[ce:hsp sp="0.25"/]]=[[ce:hsp sp="0.25"/]]unclear, 2[[ce:hsp sp="0.25"/]]=[[ce:hsp sp="0.25"/]]moderate, 3[[ce:hsp sp="0.25"/]]=[[ce:hsp sp="0.25"/]]well visualized). A higher score indicated better visualization.

Results

T2WI was significantly superior to the other sequences in terms of prostate definition. T2*2D and T2*3D were strongly superior to the other sequences and were significantly superior in terms of fiducial marker definition.

Conclusions

T2*2D and T2*3D are superior to the other sequences for prostate contouring and marker identification. Therefore, we recommend initial T2*3D and T2*2D examinations.

Abstract

Aim

Prostate contouring using CT alone is difficult. To overcome the uncertainty, CT/MRI registration using a fiducial marker is generally performed. However, visualization of the marker itself can be difficult with MRI. This study aimed to determine the optimal MRI pulse sequence for defining the marker as well as the prostate outline among five sequences.

Materials and methods

A total of 21 consecutive patients with prostate cancer were enrolled. Two gold fiducial markers were placed before CT/MRI examination. We used the following five sequences: T1-weighted spin-echo (T1WI; TR/TE, 400–650/8[[ce:hsp sp="0.25"/]]ms); T2-weighted fast spin-echo (T2WI; 4000/80); T2*-2D-weighted gradient echo (T2*2D; 700/18); T2*-3D-weighted gradient echo (T2*3D; TR/TE1/deltaTE, 37/14/7.3); and contrast-enhanced T1-weighted spin-echo (CE-T1WI; 400–650/8). Qualitative image analysis of the sequences was performed by three observers. These observers subjectively scored all images on a scale of 1–3 (1[[ce:hsp sp="0.25"/]]=[[ce:hsp sp="0.25"/]]unclear, 2[[ce:hsp sp="0.25"/]]=[[ce:hsp sp="0.25"/]]moderate, 3[[ce:hsp sp="0.25"/]]=[[ce:hsp sp="0.25"/]]well visualized). A higher score indicated better visualization.

Results

T2WI was significantly superior to the other sequences in terms of prostate definition. T2*2D and T2*3D were strongly superior to the other sequences and were significantly superior in terms of fiducial marker definition.

Conclusions

T2*2D and T2*3D are superior to the other sequences for prostate contouring and marker identification. Therefore, we recommend initial T2*3D and T2*2D examinations.

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Keywords

IMRT; Prostate cancer; MRI; Fiducial marker; Registration

About this article
Title

Comparison of MRI sequences in ideal fiducial maker-based radiotherapy for prostate cancer

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 22, No 6 (2017)

Pages

502-506

Published online

2017-11-01

DOI

10.1016/j.rpor.2017.10.002

Bibliographic record

Rep Pract Oncol Radiother 2017;22(6):502-506.

Keywords

IMRT
Prostate cancer
MRI
Fiducial marker
Registration

Authors

Osamu Tanaka
Hisao Komeda
Mitsuyoshi Hattori
Shigeki Hirose
Eiichi Yama
Masayuki Matsuo

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