Longitudinal study using a diode phantom for helical tomotherapy IMRT QA

Geurts, Mark; González, José; Serrano-Ojeda, P.

doi:10.1118/1.3238153

Cited by 23 publications

(20 citation statements)

References 21 publications

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“…After the calculation of the dose distribution in the phantom, point 40 reported the use of an ionization chamber array for the dosimetric verification of tomotherapy plans. The use of a device that incorporates two orthogonal diode arrays for tomotherapy IMRT QA is reported by Guerts et al 41 It should be understood that the DQA plan verification does not test all aspects of the calculated treatment plan in the patient anatomy. For example, an incorrect mass density table could be applied during the patient plan calculation.…”

Section: Viib3 Clinical Treatment Plan Qamentioning

confidence: 99%

QA for helical tomotherapy: Report of the AAPM Task Group 148a)

Langen¹,

et al. 2010

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Helical tomotherapy is a relatively new modality with integrated treatment planning and delivery hardware for radiation therapy treatments. In view of the uniqueness of the hardware design of the helical tomotherapy unit and its implications in routine quality assurance, the Therapy Physics Committee of the American Association of Physicists in Medicine commissioned Task Group 148 to review this modality and make recommendations for quality assurance related methodologies. The specific objectives of this Task Group are: ͑a͒ To discuss quality assurance techniques, frequencies, and tolerances and ͑b͒ discuss dosimetric verification techniques applicable to this unit. This report summarizes the findings of the Task Group and aims to provide the practicing clinical medical physicist with the insight into the technology that is necessary to establish an independent and comprehensive quality assurance program for a helical tomotherapy unit. The emphasis of the report is to describe the rationale for the proposed QA program and to provide example tests that can be performed, drawing from the collective experience of the task group members and the published literature. It is expected that as technology continues to evolve, so will the test procedures that may be used in the future to perform comprehensive quality assurance for helical tomotherapy units.

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Section: Viib3 Clinical Treatment Plan Qamentioning

confidence: 99%

QA for helical tomotherapy: Report of the AAPM Task Group 148a)

Langen¹,

et al. 2010

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“…The current method for performing patient DQA tests for tomotherapy at our institution is with the Delta 4 and therefore served as a standard for the PTW Seven29/Octavius device as well as film and ion chamber measurements using the cheese phantom that is the historical gold standard for tomotherapy. [91516] Plans were evaluated using the gamma index planar dose distribution and dose profile comparison.…”

Section: Methodsmentioning

confidence: 99%

“…[8–11] Diode and ion chamber arrays in conjunction with selected phantoms have also been shown to significantly reduce the time necessary to complete a patient QA when compared to film and ion chamber measurement. [89] One such diode array phantom is the ScandiDos Delta 4 which has been proven to be an accurate means of validating patient plans. [9]…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of PTW Seven29 for tomotherapy patient-specific quality assurance and comparison with ScandiDos Delta ⁴

et al. 2012

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For routine quality assurance of helical tomotherapy plans, an alternative method, as opposed to the TomoTherapy suggested cylindrical solid water phantom with film and ionization chamber, is proposed using the PTW Seven29 2D-ARRAY inserted in a dedicated octagonal phantom, called Octavius. First, the sensitivity of the array to pitch was studied by varying the pitch during planning to 0.287, 0.433, 1.0, and 2.0. For each pitch selected, the dependence on field size was investigated by generating plans with field widths (FWs) of 1.06 cm, 2.49 cm, and 5.02 cm, for a total of 12 plans. Secondly, a total of 15 patient QA plans were delivered using helical tomotherapy with the Delta4 and Seven29/Octavius for comparison. Using the clinical gamma criteria, 3% and 3 mm, all FW and pitch plans had a passing percentage of >90%. For patient QA plans, the average gamma pass percentage was 97.0% (94.4–99.8%) for the Delta4 and 97.6% (92.5-100.0%) for the Seven29/Octavius. Both the Seven29/Octavius and Delta4 performed to a high standard of measurement accuracy and had a 90% or greater gamma percent for all plans and were considered clinically acceptable.

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“…Another method for normalization of film dose was described by Thomas (Thomas et al, 2005a), which can be implemented as long ionisation chamber readings shows acceptable deviations in homogeneous regions. For arrays, one could use acceptance criteria from the following references (Geurts et al, 2009;Jursinic et al, 2010;Van Esch et al, 2007;Xu et al, 2010).…”

Section: Patient-specific Delivery Qa (Dqa)mentioning

confidence: 99%

NCS Report 27: Quality assurance for Tomotherapy systems

Althof¹,

Ost²,

Reynaert³

et al. 2017

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Longitudinal study using a diode phantom for helical tomotherapy IMRT QA

Cited by 23 publications

References 21 publications

QA for helical tomotherapy: Report of the AAPM Task Group 148a)

QA for helical tomotherapy: Report of the AAPM Task Group 148a)

Evaluation of PTW Seven29 for tomotherapy patient-specific quality assurance and comparison with ScandiDos Delta ⁴

NCS Report 27: Quality assurance for Tomotherapy systems

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Longitudinal study using a diode phantom for helical tomotherapy IMRT QA

Cited by 23 publications

References 21 publications

QA for helical tomotherapy: Report of the AAPM Task Group 148a)

QA for helical tomotherapy: Report of the AAPM Task Group 148a)

Evaluation of PTW Seven29 for tomotherapy patient-specific quality assurance and comparison with ScandiDos Delta 4

NCS Report 27: Quality assurance for Tomotherapy systems

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Evaluation of PTW Seven29 for tomotherapy patient-specific quality assurance and comparison with ScandiDos Delta ⁴