open access

Vol 22, No 3 (2017)
Published online: 2017-05-01
Submitted: 2016-05-17
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Evaluation of cone-beam computed tomography image quality assurance for Vero4DRT system

Hideharu Miura, Shuichi Ozawa, Masahiro Hayata, Shintarou Tsuda, Tsubasa Enosaki, Kiyoshi Yamada, Yasushi Nagata
DOI: 10.1016/j.rpor.2016.12.001
·
Rep Pract Oncol Radiother 2017;22(3):258-263.

open access

Vol 22, No 3 (2017)
Published online: 2017-05-01
Submitted: 2016-05-17

Abstract

We report the characteristics of quality assurance (QA) image for Vero4DRT system with a kilo-voltage (kV) cone-beam computed tomography (CBCT) capability to perform image-guided radiation therapy (IGRT). To acquire a set of CBCT, the kV source is rotated either 215° clockwise (CW) (tube 1 from 5° to 220° and tube 2 from 275° to 130°) or counterclockwise (CCW) (tube 1 from 85° to 230° and tube 2 from 355° to 140°). Image geometry, image uniformity, high/low contrast resolutions, and contrast linearity were measured with a Catphan 504 CT phantom (The Phantom Laboratory, NY). The comparison between measured and expected distances shows an excellent agreement. The CBCT for Vero4DRT system cannot perform a full 360° rotation, which leads to a loss in uniformity for image acquisition. Separations were observed for high-contrast resolution, with eight line pairs per centimeter corresponding to a gap size of 0.063[[ce:hsp sp="0.25"/]]cm. For low-contrast resolution, the seventh largest hole was visible. This hole has a 4-mm diameter with 1.0% contrast level. We should check the contrast linearity compared with known value, even though it is out of range from the manufacturer manual.

Abstract

We report the characteristics of quality assurance (QA) image for Vero4DRT system with a kilo-voltage (kV) cone-beam computed tomography (CBCT) capability to perform image-guided radiation therapy (IGRT). To acquire a set of CBCT, the kV source is rotated either 215° clockwise (CW) (tube 1 from 5° to 220° and tube 2 from 275° to 130°) or counterclockwise (CCW) (tube 1 from 85° to 230° and tube 2 from 355° to 140°). Image geometry, image uniformity, high/low contrast resolutions, and contrast linearity were measured with a Catphan 504 CT phantom (The Phantom Laboratory, NY). The comparison between measured and expected distances shows an excellent agreement. The CBCT for Vero4DRT system cannot perform a full 360° rotation, which leads to a loss in uniformity for image acquisition. Separations were observed for high-contrast resolution, with eight line pairs per centimeter corresponding to a gap size of 0.063[[ce:hsp sp="0.25"/]]cm. For low-contrast resolution, the seventh largest hole was visible. This hole has a 4-mm diameter with 1.0% contrast level. We should check the contrast linearity compared with known value, even though it is out of range from the manufacturer manual.

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Keywords

Vero4DRT; Cone-beam computed tomography; Quality assurance; Image-guided radiation therapy

About this article
Title

Evaluation of cone-beam computed tomography image quality assurance for Vero4DRT system

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 22, No 3 (2017)

Pages

258-263

Published online

2017-05-01

DOI

10.1016/j.rpor.2016.12.001

Bibliographic record

Rep Pract Oncol Radiother 2017;22(3):258-263.

Keywords

Vero4DRT
Cone-beam computed tomography
Quality assurance
Image-guided radiation therapy

Authors

Hideharu Miura
Shuichi Ozawa
Masahiro Hayata
Shintarou Tsuda
Tsubasa Enosaki
Kiyoshi Yamada
Yasushi Nagata

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