Performance of an ExacTrac Image Guidance System in Mask-based Cranial Radiotherapy on a Classic Novalis Machine: A Five Year Experience

Jani, Shirish; Weinstein, G.; Shah, N.; Volpp, P.; Glazebrook, S.; Pothilat, J.; Ott, Kenneth

doi:10.1016/j.ijrobp.2010.07.1773

Cited by 1 publication

(2 citation statements)

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“…In a 5-year experience performance study of ET (March 2005 to March 2010) an excellent result of <1 mm was recorded for positional accuracy in a total of 94 patients. Deviations in head position within the mask required shifts of up to 3 mm in 26% which highlights the need for image verification before each treatment arc, something that is now common practice 14 . In further support of this observation, a 2012 quantitative analysis of 849 images was carried out by Lesiuk et al 15 with the objective to measure setup and intrafraction variability using ET.…”

Section: Overall Accuracymentioning

confidence: 95%

“…Deviations in head position within the mask required shifts of up to 3 mm in 26% which highlights the need for image verification before each treatment arc, something that is now common practice. 14 In further support of this observation, a 2012 quantitative analysis of 849 images was carried out by Lesiuk et al 15 with the objective to measure setup and intrafraction variability using ET. The averaged results were a setup offset of 1•98 mm and post-treatment offset of 0•66 mm.…”

Section: Calibration Of the Et Systemmentioning

confidence: 96%

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An evaluation of the BrainLAB 6D ExacTrac/Novalis Tx System for image-guided intracranial radiotherapy

Montgomery

Collins

2017

J Radiother Pract

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PurposeStereotactic-fractionated radiotherapy and radiosurgery (RS) for benign and malignant intracranial lesions relies on a very high degree of accuracy in dose alignment due to the ablative dose delivered, and therefore requires a high-precision image guidance modality. The aim of this review is to investigate the localisation and verification accuracy performance of ExacTrac (ET) and Novalis Tx System.Materials and methodsA systematic review of the database Science Direct was carried out using search terms ‘stereotactic radiotherapy (SRT)’ and ‘ET’. All articles before 2000 were excluded. Only articles that involved intracranial lesions, with the exception of one article, were included in the final review.ResultsResults from gold standard Hidden Target Tests and patient data show that patient position can be reproduced within 1·0 mm with the use of ET imaging. In addition, the 6 degrees of freedom algorithm function of ET allows for better translational accuracy as well optimal positioning when rotations are corrected for. Studies showed excellent correlation (p<0·01) between bony ET images and cone beam computed tomography (CBCT) soft tissue registration, evidencing the safe reliance of bony anatomy for image guidance via ET. Shifts were found to be comparable between CBCT and ET.ConclusionThere is the need for regular calibration to prevent systematic errors and potential geographic miss. However, due to ET’s additional benefits, including reduced concomitant dose and faster imaging time, ET is the superior image guidance modality for RS/SRT in the treatment of intracranial lesions.

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Section: Overall Accuracymentioning

confidence: 95%

Section: Calibration Of the Et Systemmentioning

confidence: 96%