IMPROVEMENT OF PRECISION IN SPATIAL LOCALIZATION OF RADIO-OPAQUE MARKERS USING THE 2-FILM TECHNIQUE

被引:21
作者
LAM, KL
TENHAKEN, RK
机构
关键词
D O I
10.1118/1.596620
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
Radio-opaque markers implanted inside or placed on the skin of patients can be used to detect setup errors and patient motion. The effects of imaging geometry accuracy for standard radiotherapy equipment on the precision of calculating the positions of radio-opaque spherical markers using two orthogonal radiographic film projections is investigated. Inaccuracies in the imaging geometry are computed from the manually digitized positions of the marker images on each film pair. Actual marker locations are calculated with a precision limited only by the variance in manual digitization by incorporating those imaging geometry inaccuracies into their computation. Results of a phantom study using a grid of markers in a plastic block indicate that submillimeter precision can be obtained for the spatial coordinates of individual markers, and that the precision is not sensitive to the small inaccuracies in imaging geometry present within the mechanical tolerances of modern radiotherapy treatment machines and simulators.
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页码:1126 / 1131
页数:6
相关论文
共 11 条
[1]   A GENERAL-APPROACH TO THE LOCATION OF RADIOPAQUE OBJECTS, WITH APPLICATIONS IN RADIOTHERAPY [J].
CHRISTOPHERSON, DA ;
JONES, D .
PHYSICS IN MEDICINE AND BIOLOGY, 1984, 29 (12) :1581-1586
[2]   INTEGRATION OF MAGNETIC-RESONANCE-IMAGING INTO RADIATION-THERAPY TREATMENT PLANNING .1. TECHNICAL CONSIDERATIONS [J].
FRAASS, BA ;
MCSHAN, DL ;
DIAZ, RF ;
TENHAKEN, RK ;
AISEN, A ;
GEBARSKI, S ;
GLAZER, G ;
LICHTER, AS .
INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS, 1987, 13 (12) :1897-1908
[3]   RADIOTHERAPY PLANNING - DIRECT TUMOR LOCATION ON SIMULATION AND PORT FILMS USING CT .1. PRINCIPLES [J].
HAYNOR, DR ;
BORNING, AW ;
GRIFFIN, BA ;
JACKY, JP ;
KALET, IJ ;
SHUMAN, WP .
RADIOLOGY, 1986, 158 (02) :537-540
[4]  
JONES D, 1990, International Journal of Radiation Oncology, Biology, Physics, V19, P134, DOI 10.1016/0360-3016(90)90671-6
[5]   A COMPUTER ALGORITHM FOR RECONSTRUCTING A SCENE FROM 2 PROJECTIONS [J].
LONGUETHIGGINS, HC .
NATURE, 1981, 293 (5828) :133-135
[6]   DETERMINATION OF 3-DIMENSIONAL STRUCTURE IN BIPLANE RADIOGRAPHY WITHOUT PRIOR KNOWLEDGE OF THE RELATIONSHIP BETWEEN THE 2 VIEWS - THEORY [J].
METZ, CE ;
FENCIL, LE .
MEDICAL PHYSICS, 1989, 16 (01) :45-51
[7]  
PRESS WH, 1986, NUMERICAL RECIPES, P289
[8]   2-FILM BRACHYTHERAPY RECONSTRUCTION ALGORITHM [J].
SIDDON, RL ;
CHIN, LM .
MEDICAL PHYSICS, 1985, 12 (01) :77-83
[9]  
TENHAKEN RK, 1989, MED PHYS, V16, P678
[10]   MOTION AND STRUCTURE FROM 2 PERSPECTIVE VIEWS - ALGORITHMS, ERROR ANALYSIS, AND ERROR ESTIMATION [J].
WENG, JY ;
HUANG, TS ;
AHUJA, N .
IEEE TRANSACTIONS ON PATTERN ANALYSIS AND MACHINE INTELLIGENCE, 1989, 11 (05) :451-476