Evaluation of high resolution MR imaging of the pelvis using a endorectal coil

我们使用直肠内线圈结合相控阵线圈获得并评估前列腺癌、子宫颈癌和直肠癌的MR图像。同时使用直肠内线圈可显著提高信噪比。与仅使用相控阵线圈相比，这种线圈组合能更准确地显示微小病变和肿瘤侵犯(T分期)。T2加权像在前列腺癌的诊断和评估其包膜外侵犯方面是有用的。动态研究有助于宫颈癌的诊断及其T分期。对于直肠癌，T2加权像对直肠壁层和T分期有较好的评价价值。T2加权图像与动态研究相结合，提高了诊断的准确性。直肠内线圈也提高了肿瘤侵犯其他盆腔器官的诊断准确率。直肠内线圈也可用于评估直肠附近的膀胱肿瘤和下段输尿管肿瘤。目前直肠内线圈有点太大，会给患者带来不适。我们需要改进直肠内线圈的大小和形状。我们希望积累更多的病例，并评估直肠内线圈的有效性。

We obtained and evaluated MR images of prostate cancer, uterine cervical cancer, and rectal cancer using a endorectal coil combined with phased array coils. Concominant use of endorectal coil improved signal to noise ratio significantly. Small lesions and tumor invasion (T-staging) were more accurately demonstrated by this coil combination compared with phased array coils only. T2-weighted images were useful in detection of prostate cancer and evaluation of its extracapsular invasion. Dynamic study was useful in detection of uterine cervical cancer and its T-staging. On rectal cancer, T2-weighted images were useful to evaluate of the rectal wall layer and T-staging. T2-weighted images and dynamic study together improved the diagnostic accuracy. Endorectal coil also improved diagnostic accuracy of tumor inavasion to other pelvic organs. Endorectal coil may also be useful to evaluate bladder tumor and lower uretheral tumors near the rectum. Endorectal coils are a little too large at the moment and cause patients discomforts. We need to improve the size and shape of endorectal coil. We would like to accumulate more cases and evaluate the usefulness of endorectal coil.