Analysis of megavoltage computed tomography imaging on a helical tomotherapy unit.
- Author:
Xiangkun DAI
1
;
Yunlai WANG
;
Shouping XU
;
Zhongjian JU
;
Ruigang GE
;
Chuanbin XIE
;
Hanshun GONG
Author Information
- Publication Type:Journal Article
- MeSH: Radiotherapy Planning, Computer-Assisted; instrumentation; Tomography, Spiral Computed; instrumentation
- From:Chinese Journal of Medical Instrumentation 2010;34(6):458-461
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo evaluate the image quality of megavoltage computed Tomography imaging.
METHODSThe HU uniformity and linearity, image noise, spatial resolution, low contrast resolution and spatial linearity in MVCT mode were evaluated with Catphan 600 phantom, and the factor of pitch was also evaluated. Influencing factors of image quality were also discussed.
RESULTSThe MVCT values depended linearly on the physical density of the sample. The MVCT values uniformity was good. The spatial resolution was 4 lp/cm. The use of an MV Beam for imaging results in the loss of low contrast resolution, but it is sufficient for pretreatment image guidance. The geometric accuracy was good.
CONCLUSIONSThe image quality of MVCT is less than that of KVCT, but is good enough for IGRT.
