Positioning errors of CT common rail technique in intensity-modulated radiotherapy for nasopharyngeal carcinoma.
- Author:
Fei TIAN
1
;
Zihai XU
;
Li MO
;
Chaohua ZHU
;
Chaomin CHEN
Author Information
- Publication Type:Journal Article
- MeSH: Adult; Aged; Aged, 80 and over; Carcinoma; Female; Humans; Male; Middle Aged; Nasopharyngeal Neoplasms; radiotherapy; Patient Positioning; Radiotherapy, Intensity-Modulated; methods; Tomography, X-Ray Computed; methods
- From: Journal of Southern Medical University 2012;32(11):1655-1657
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo evaluate the value of CT common rail technique for application in intensity-modulated radiotherapy for nasopharyngeal carcinoma (NPC).
METHODSTwenty-seven NPC patients underwent Somatom CT scans using the Siemens CTVision system prior to the commencement of the radiotherapy sessions. The acquired CT images were registered with the planning CT images using the matching function of the system to obtain the linear set-up errors of 3 directions, namely X (left to right), Y (superior to inferior), and Z (anterior to posterior). The errors were then corrected online on the moving couch.
RESULTSThe 27 NPC patients underwent a total of 110 CT scans and the displacement deviations of the X, Y and Z directions were -0.16∓1.68 mm, 0.25∓1.66 mm, and 0.33∓1.09 mm, respectively.
CONCLUSIONCT common rail technique can accurately and rapidly measure the space error between the posture and the target area to improve the set-up precision of intensity-modulated radiotherapy for NPC.
