Three-dimensional movement of a liver tumor detected by high-speed magnetic resonance imaging

被引：95

作者：

Shimizu, S ^{[1
]}

Shirato, B ^{[1
]}

Xo, B ^{[1
]}

Kagei, K ^{[1
]}

Nishioka, T ^{[1
]}

Hashimoto, S ^{[1
]}

Tsuchiya, K ^{[1
]}

Aoyama, H ^{[1
]}

Miyasaka, K ^{[1
]}

机构：

[1] Hokkaido Univ, Sch Med, Dept Radiol, Kita Ku, Sapporo, Hokkaido 0608638, Japan

来源：

RADIOTHERAPY AND ONCOLOGY | 1999年 / 50卷 / 03期

关键词：

liver; radiotherapy; three-dimensional treatment planning; organ movement;

D O I：

10.1016/S0167-8140(98)00140-6

中图分类号：

R73 [肿瘤学];

学科分类号：

100214 ;

摘要：

Objective: Three-dimensional (3D) movement of a spherical liver tumor during respiration was investigated with magnetic resonance imaging (MRI) using a high-speed sequence. Methods: A marker was placed on the surface of the patient as a reference of distance. Repetition time (TR) was 7.7 ms, echo time (TE) was 4.2 ms, flip angle was 20 degrees, section thickness was 8 mm, and a 256 X 128 matrix was used. The acquisition time was 1.0 s followed by an interval of 0.5 s. The 20 tumor contours extracted during 30 s were superimposed on sagittal and coronal MR images. Results: The maximum value of tumor edge location was 3.9 cm in the cranio-caudal direction, 2.3 cm in the ventro-dorsal direction, and 3.1 cm in the lateral direction. The mean length of tumor displacement observed was 2.1 cm in the cranio-caudal direction, 0.8 cm in the ventro-dorsal and 0.9 cm in the left-right direction, respectively. The locus of the center of the tumor contour in the sagittal cross section was inclined at 23 degrees and in the coronal cross section was inclined at 18 degrees to the cranio-caudal axis of body. Conclusion: In conclusion, 3D movement of a spherical liver tumor was detected using rapid MRI sequential examinations. Magnetic resonance imaging has a potential to improve the accuracy of the planning target volume of a liver tumor. (C) 1999 Elsevier Science Ireland Ltd. All rights reserved.

引用

页码：367 / 370

页数：4

共 10 条

[1] Uncertainties in CT-based radiation therapy treatment planning associated with patient breathing [J].