PMID- 11747997
OWN - NLM
STAT- MEDLINE
DCOM- 20020307
LR  - 20191105
IS  - 0958-3947 (Print)
IS  - 1873-4022 (Linking)
VI  - 26
IP  - 4
DP  - 2001 Winter
TI  - Quantitative analysis of errors in fractionated stereotactic radiotherapy.
PG  - 315-8
AB  - Fractionated stereotactic radiotherapy (FSRT) offers a technique to minimize the 
      absorbed dose to normal tissues; therefore, quality assurance is essential for 
      these procedures. In this study, quality assurance for FSRT of 58 cases, between 
      August 1995 and August 1997 are described, and the errors for each step and 
      overall accuracy were estimated. Some of the important items for FSRT procedures 
      are: accuracy in CT localization, transferred image distortion, laser alignment, 
      isocentric accuracy of linear accelerator, head frame movement, portal 
      verification, and various human errors. A geometric phantom, that has known 
      coordinates was used to estimate the accuracy of CT localization. A treatment 
      planning computer was used for checking the transferred image distortion. The 
      mechanical isocenter standard (MIS), rectilinear phantom pointer: (RLPP), and 
      laser target localizer frame (LTLF) were used for laser alignment and target 
      coordinates setting. Head-frame stability check was performed by a depth 
      confirmation helmet (DCH). A film test was done to check isocentric accuracy and 
      portal verification. All measured data for the 58 patients were recorded and 
      analyzed for each item. 4-MV x-rays from a linear accelerator, were used for 
      FSRT, along with homemade circular cones with diameters from 20 to 70 mm 
      (interval: 5 mm). The accuracy in CT localization was 1.2+/-0.5 mm. The 
      isocentric accuracy of the linear accelerator, including laser alignment, was 
      0.5+/-0.2 mm. The reproducibility of the head frame was 1.1+/-0.6 mm. The overall 
      accuracy was 1.7+/-0.7 mm, excluding human errors.
FAU - Choi, D R
AU  - Choi DR
AD  - Department of Medical Physics, Tom Baker Cancer Centre, University of Calgary, 
      Alberta, Canada.
FAU - Kim, D Y
AU  - Kim DY
FAU - Ahn, Y C
AU  - Ahn YC
FAU - Huh, S J
AU  - Huh SJ
FAU - Yeo, I J
AU  - Yeo IJ
FAU - Nam, D H
AU  - Nam DH
FAU - Lee, J I
AU  - Lee JI
FAU - Park, K
AU  - Park K
FAU - Kim, J H
AU  - Kim JH
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - Med Dosim
JT  - Medical dosimetry : official journal of the American Association of Medical 
      Dosimetrists
JID - 8908862
SB  - IM
MH  - Brain Neoplasms/diagnostic imaging/*radiotherapy
MH  - *Dose Fractionation, Radiation
MH  - *Evaluation Studies as Topic
MH  - Humans
MH  - Image Processing, Computer-Assisted
MH  - Mathematical Computing
MH  - *Medical Errors
MH  - Particle Accelerators
MH  - *Quality Assurance, Health Care
MH  - Radiotherapy Planning, Computer-Assisted
MH  - Reproducibility of Results
MH  - *Stereotaxic Techniques
MH  - Tomography, X-Ray Computed
EDAT- 2001/12/19 10:00
MHDA- 2002/03/08 10:01
CRDT- 2001/12/19 10:00
PHST- 2001/12/19 10:00 [pubmed]
PHST- 2002/03/08 10:01 [medline]
PHST- 2001/12/19 10:00 [entrez]
AID - S0958394701000826 [pii]
AID - 10.1016/s0958-3947(01)00082-6 [doi]
PST - ppublish
SO  - Med Dosim. 2001 Winter;26(4):315-8. doi: 10.1016/s0958-3947(01)00082-6.