MR imaging of the female pelvis at 3 Tesla: Evaluation of image homogeneity using different dielectric pads

被引：25

作者：

Kataoka, Masako ^{[1
,2
]}

Isoda, Hiroyoshi ^{[2
]}

Maetani, Yoji ^{[2
]}

Nakamoto, Yuji ^{[2
]}

Koyama, Takashi ^{[3
]}

Umeoka, Shigeaki ^{[4
]}

Tamai, Ken ^{[2
]}

Kido, Aki ^{[2
]}

Morisawa, Nobuko ^{[2
]}

Saga, Tsuneo ^{[5
]}

Togashi, Kaori ^{[2
]}

机构：

[1] Univ Cambridge, Addenbrookes Hosp, Dept Radiol, Cambridge CB2 0QQ, England

[2] Kyoto Univ, Grad Sch Med, Dept Diagnost Imaging & Nucl Med, Kyoto, Japan

[3] Kyoto Univ Hosp, Dept Radiol, Kyoto 606, Japan

[4] Wakayama Med Ctr, Japan Red Cross Soc, Dept Radiol, Wakayama, Japan

[5] Natl Inst Radiol Sci, Mol Imaging Ctr, Chiba 260, Japan

来源：

JOURNAL OF MAGNETIC RESONANCE IMAGING | 2007年 / 26卷 / 06期

关键词：

MRI; pelvis; high magnetic field; dielectric effect; 3; Tesla;

D O I：

10.1002/JMRI.21173

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 [临床医学]; 100207 [影像医学与核医学]; 1009 [特种医学];

摘要：

Purpose: To evaluate improvements in image homogeneity in pelvic MR imaging at 3 Tesla M using two different dielectric pads. Materials and Methods: A total of eight healthy females were scanned using a 3T MR scanner equipped with a body-array coil. Axial and sagittal fast spin-echo T2-weighted images (T2WI) (TR/TE = 3200 msec/94 msec), axial fast spin-echo T1-weighted images (T1WI) (TR/TE = 700 msec/11 msec), and sagittal half-Fourier acquisition single-shot turbo spin-echo (HASTE) images (TR/TE = 3000 msec/100 msec) were performed for pelvic imaging. Sequences were repeated with dielectric pads (consisting of either ultrasound [US] gel or water), and without pads. Three or four regions of interest (ROIs) were placed on fatty tissues and the ratio of minimum to maximum signal intensity (RSI) was calculated as a marker of image homogeneity. Results: RSI was significantly higher on T2WI and T1WI when using dielectric pads than when no pad was use. A similar tendency was observed in RSI on HASTE. No significant difference was found between images with US gel pads and those with water pads. Conclusion: Dielectric pads consisting of either US gel or water are effective in improving image homogeneity of the pelvis on 3T MRI.

引用

页码：1572 / 1577

页数：6

共 22 条

[1]

Vessel contrast at three Tesla in time-of-flight magnetic resonance angiography of the intracranial and carotid arteries [J].