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Software-controlled, highly automated intrafraction prostate motion correction with intrafraction stereographic targeting: System description and clinical resultsa)
a)Presented in part at the 10th Biennial ESTRO meeting on Physics and Radiation Technology for Clinical Radiotherapy, August 30th–September 3rd 2009, Maastricht, The Netherlands.
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10.1118/1.3684953
/content/aapm/journal/medphys/39/3/10.1118/1.3684953
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/39/3/10.1118/1.3684953

Figures

Image of FIG. 1.
FIG. 1.

Beams for the seven-field IMRT technique. Beam 1 is used in combination with an orthogonal kV beam for 3D pretreatment SGT corrections, while beams 3 and 6 are used for iSGT intrafraction corrections in the sagittal plane.

Image of FIG. 2.
FIG. 2.

iSGT workflow. Abbreviations: AM = automated match, eth = error threshold for correction in mm; AIMS = automated identification of marker match success; M = number of detected markers; Mth = threshold for M.

Image of FIG. 3.
FIG. 3.

Cumulative distributions of residual effective fraction set-up errors. Errors are given as lengths of 2D effective fraction error vectors in the sagittal plane, and comprise both systematic and random components.

Image of FIG. 4.
FIG. 4.

Cumulative distributions of residual effective systematic set-up errors per patient. Errors are given as lengths of 2D effective fraction error vectors in the sagittal plane.

Tables

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TABLE I.

Performance of the AIMS test for detection of AM successes, defined as |AM − GT|< 2 mm (GT = ground truth), as a function of the parameter Mth. The data were obtained from AM for a total of 970 MV-images.

Generic image for table
TABLE II.

Performance of the AM algorithm in detecting true set-up errors larger than the threshold error, eth. Clinically eth = 4 mm was used. Computer simulations were used to generate data for eth = 3 mm and eth = 2 mm.

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TABLE III.

Simulated population effective setup errors for the initial group of 20 patients in SI and AP directions.

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TABLE IV.

Evaluation of iSGT using images from the 100 clinical iSGT patients; the table shows measured displacements just after initial setup and as well as displacements without and with iSGT corrections for the clinical action level of 4 mm. Simulated displacements for action levels of 3 and 2 mm as well as for the NAL-based off-line protocol to correct intrafraction motion are also shown.

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2012-02-17
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Software-controlled, highly automated intrafraction prostate motion correction with intrafraction stereographic targeting: System description and clinical resultsa)
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/39/3/10.1118/1.3684953
10.1118/1.3684953
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