Integrated megavoltage portal imaging with a 1.5 T MRI linac

被引：31

作者：

Raaymakers, B. W. ^{[1
]}

de Boer, J. C. J. ^{[1
]}

Knox, C. ^{[1
]}

Crijns, S. P. M. ^{[1
]}

Smit, K. ^{[1
]}

Stam, M. K. ^{[1
]}

van den Bosch, M. R. ^{[1
]}

Kok, J. G. M. ^{[1
]}

Lagendijk, J. J. W. ^{[1
]}

机构：

[1] Univ Med Ctr Utrecht, Dept Radiotherapy, NL-3584 CX Utrecht, Netherlands

来源：

PHYSICS IN MEDICINE AND BIOLOGY | 2011年 / 56卷 / 19期

关键词：

RADIOTHERAPY; DEVICE; VERIFICATION; DISTORTIONS; QUALITY; CANCER;

D O I：

10.1088/0031-9155/56/19/N01

中图分类号：

R318 [生物医学工程];

学科分类号：

0831 ;

摘要：

In this note, the feasibility of complementing our hybrid 1.5 T MRI linac (MRL) with a megavoltage (MV) portal imager is investigated. A standard aSi MV detector panel is added to the system and both qualitative and quantitative performances are determined. Simultaneous MR imaging and transmission imaging can be performed without mutual interference. The MV image quality is compromised by beam transmission and longer isocentre distance; still, the field edges and bony anatomy can be detected at very low dose levels of 0.4 cGy. MV imaging integrated with the MRL provides an independent and well-established position verification tool, a field edge check and a calibration for alignment of the coordinate systems of the MRI and the accelerator. The portal imager can also be a valuable means for benchmarking MRI-guided position verification protocols on a patient-specific basis in the introductory phase.

引用

页码：N207 / N214

页数：8

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