A computer-controlled conformal radiotherapy system I: Overview

Fraass, Benedick A.; McShan, Daniel L.; Kessler, Marc L.; Matrone, Gwynne M.; Lewis, James D.; Weaver, Tamar A.

doi:10.1016/0360-3016(95)02052-7

Cited by 45 publications

(14 citation statements)

References 79 publications

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“…Therefore, gold marker migration has been studied by several investigators to quantify and characterize the movements of the markers within the prostate gland. It has been established that there is a migration of the markers within the prostate gland, but this deviations were not shown to be significant [25,26]. Furthermore, gold marker displacement due to prostate movement during external beam radiotherapy has been analyzed in many studies as well [1-5].…”

Section: Discussionmentioning

confidence: 99%

Gold marker displacement due to needle insertion during HDR-brachytherapy for treatment of prostate cancer: A prospective cone beam computed tomography and kilovoltage on-board imaging (kV-OBI) study

et al. 2012

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PurposeTo evaluate gold marker displacement due to needle insertion during HDR-brachytherapy for therapy of prostate cancer.Patients and methods18 patients entered into this prospective evaluation. Three gold markers were implanted into the prostate during the first HDR-brachytherapy procedure after the irradiation was administered. Three days after marker implantation all patients had a CT-scan for planning purpose of the percutaneous irradiation. Marker localization was defined on the digitally-reconstructed-radiographs (DRR) for daily (VMAT technique) or weekly (IMRT) set-up error correction. Percutaneous therapy started one week after first HDR-brachytherapy. After the second HDR-brachytherapy, two weeks after first HDR-brachtherapy, a cone-beam CT-scan was done to evaluate marker displacement due to needle insertion. In case of marker displacement, the actual positions of the gold markers were adjusted on the DRR.ResultsThe value of the gold marker displacement due to the second HDR-brachytherapy was analyzed in all patients and for each gold marker by comparison of the marker positions in the prostate after soft tissue registration of the prostate of the CT-scans prior the first and second HDR-brachytherapy. The maximum deviation was 5 mm, 7 mm and 12 mm for the anterior-posterior, lateral and superior-inferior direction. At least one marker in each patient showed a significant displacement and therefore new marker positions were adjusted on the DRRs for the ongoing percutaneous therapy.ConclusionsNeedle insertion in the prostate due to HDR-brachytherapy can lead to gold marker displacements. Therefore, it is necessary to verify the actual position of markers after the second HDR-brachytherapy. In case of significant deviations, a new DRR with the adjusted marker positions should be generated for precise positioning during the ongoing percutaneous irradiation.

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Section: Discussionmentioning

confidence: 99%

Gold marker displacement due to needle insertion during HDR-brachytherapy for treatment of prostate cancer: A prospective cone beam computed tomography and kilovoltage on-board imaging (kV-OBI) study

et al. 2012

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“…The software control system has been replaced by an in‐house package that provides image acquisition and alignment tools 4 . This software package communicates directly over an ethernet connection with an in‐house computer‐controlled radiotherapy system (CCRS), 5 providing direct control of all treatment setup parameters, including treatment couch position. Using this system, transformations determined from alignment of reference and portal images can be automatically sent to the accelerator control computer.…”

Section: Methodsmentioning

confidence: 99%

A comparison of computer‐controlled versus manual on‐line patient setup adjustment

Brock

McShan

Balter

2002

J Applied Clin Med Phys

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A study was performed to determine the relative advantage of computer‐controlled couch movement versus manual repositioning to correct patient setup error measured using an electronic portal imaging device (EPID). Twenty‐eight on‐line setup adjustment trials of anterior‐posterior (AP) pelvic projections were evaluated, with 13 setups corrected by automated couch movement determined by direct feedback from the EPID image alignment tool and 15 setups manually corrected based on the transformation displayed from the same tool. The speed of setup adjustment and accuracy of corrected setup were determined. Computer controlled setup adjustment was determined to be faster (25.4 s versus 101.9 s) and slightly more accurate (1.8 mm versus 2.5 mm error in adjusted setup) than manual correction.PACS number(s): 87.57.–s, 87.53.–j

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“…There are two classifications of immobilization devices, namely simple and complex. Simple immobilization devices restrict "some" patient movement and therefore patient movements will not be entirely deterred [21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Set-up Parameters in Head and Neck Patients at the Charlotte Maxeke Johannesburg Academic Hospital (A Review of Current Clinical Practice)

Wyk¹,

Dumela²,

Dg³

2017

J Integr Oncol

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This study aimed to collect and analyze the recorded daily setup parameters of the bed as incidentally captured on an integrated record and verify system. This was done on some radical head and neck patients treated from 2008 to 2010 at Charlotte Maxeke Johannesburg Academic Hospital (CMJAH) in South Africa. Most of these patients had anterior neck fields that were set-up using fixed couch longitudinal movements (meaning more than one treatment isocentre). It was hoped that the ideal absolute position of the patient on the bed relative to the isocentre of the treatment machine, for a course of head and neck radiotherapy at CMJAH, could be established. Knowledge of the set-up margin achievable could also assist in defining the tolerance assigned to couch parameters on the electronic record and verify system, such that setup is restricted accordingly.

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A computer-controlled conformal radiotherapy system I: Overview

Cited by 45 publications

References 79 publications

Gold marker displacement due to needle insertion during HDR-brachytherapy for treatment of prostate cancer: A prospective cone beam computed tomography and kilovoltage on-board imaging (kV-OBI) study

Gold marker displacement due to needle insertion during HDR-brachytherapy for treatment of prostate cancer: A prospective cone beam computed tomography and kilovoltage on-board imaging (kV-OBI) study

A comparison of computer‐controlled versus manual on‐line patient setup adjustment

Analysis of Set-up Parameters in Head and Neck Patients at the Charlotte Maxeke Johannesburg Academic Hospital (A Review of Current Clinical Practice)

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