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Int J Radiat Oncol Biol Phys. 2007 Nov 15;69(4):970-3.

Verification of in-treatment tumor position using kilovoltage cone-beam computed tomography: a preliminary study.

Author information

1
Department of Radiology, University of Tokyo Hospital, Tokyo, Japan. k-nak@fg7.so-net.ne.jp

Abstract

Three-dimensional tumor position during rotational dose delivery was evaluated by acquiring in-treatment kilovoltage (kV) cone-beam CT (CBCT) to ensure treatment quality. The CBCT projection data of a phantom were acquired during rotational megavoltage (MV) dose delivery up to 6 Gy to evaluate image quality under MV beam irradiation. A lung tumor patient was treated with a total dose of 48 Gy in four fractions, each fraction including seven coplanar and noncoplanar beams, as well as a full-angle rotational beam. Tumor registration was performed between a planning CT image and a CBCT image immediately after patient setup. The patient couch was adjusted according to the registration results, and then the registration was repeated three times: immediately before treatment, during treatment, and immediately after treatment. The phantom image quality of the kV CBCT was not visually degraded up to the rotational MV dose of 6 Gy. Tumor position during rotational dose delivery was verified for the first time using kV CBCT.

PMID:
17967297
DOI:
10.1016/j.ijrobp.2007.08.026
[Indexed for MEDLINE]

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