Quality assurance of carbon ion and proton beams: A feasibility study for using the 2D MatriXX detector

Anvar, Mohammad Varasteh; Attili, A.; Ciocca, Mario; Donetti, M.; Guarachi, Leslie Karen Fanola; Fausti, F.; Giordanengo, S.; Marchetto, F.; Molinelli, S.; Monaco, V.; Sacchi, R.; Vignati, A.; Cirio, R.

doi:10.1016/j.ejmp.2016.05.058

Cited by 20 publications

(13 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Segmented ICs are also adequate for planar dose checks but for the low spatial resolution (5–10 mm) these dosimeters are not recommended for commissioning and TPS validation while are a good choice for QA tests …”

Section: Detectors For Absorbed Dose In Nonreference Conditionsmentioning

confidence: 99%

Dose detectors, sensors, and their applications

Giordanengo

2018

Medical Physics

View full text Add to dashboard Cite

This article is intended to present the different types of particle and radiation detectors available for applications in particle therapy. Several types of detectors and sensors exist for measurements of absorbed dose in reference and nonreference conditions and the ones in use for beam monitoring. Therefore, this manuscript focuses on the following applications: (a) primary methods for dosimetry in ion beams, (b) measurements of absorbed dose in realistic patient‐specific scenarios with different dose delivery configurations, and (c) beam monitoring. Water and graphite calorimeters, Faraday cups, ionization based gas detectors are described first, followed by the description of the protocols for proton and ion dosimetry. Then films, scintillator and solid‐state detectors are reviewed. Finally, several types of ionization chambers (large, pinpoint, arrays of chambers arranged in regular 1D or 2D pattern, parallel‐plate configuration with large integral electrodes or with anode segmented in strips or pixels, multi‐wire, and the multi‐gap prototype) have been considered. New beam monitors to deal with a wide range of intensity and pulsed beams expected from new accelerators, different dose fractionation and advanced delivery techniques are presented. The existing detectors available for particle therapy have been described taking into account the different requirements for devices used in reference and nonreference conditions and the ones designed for beam monitoring.

show abstract

Section: Detectors For Absorbed Dose In Nonreference Conditionsmentioning

confidence: 99%

Dose detectors, sensors, and their applications

Giordanengo

2018

Medical Physics

View full text Add to dashboard Cite

show abstract

“…For intensity-modulated proton therapy (IMPT), several studies have investigated the use of these 2D detector arrays, especially the MatriXX PT detector array (IBA dosimetry, Schwarzenbruck, Germany). [15][16][17][18][19] These studies mainly deal with the general applicability of the detectors for plan verification measurements. A detailed analysis of the applicability of these arrays in IMPT by studying their signal theoretical properties has not been performed so far.…”

Section: Introductionmentioning

confidence: 99%

“…For intensity‐modulated proton therapy (IMPT), several studies have investigated the use of these 2D detector arrays, especially the MatriXX PT detector array (IBA dosimetry, Schwarzenbruck, Germany) 15–19 . These studies mainly deal with the general applicability of the detectors for plan verification measurements.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the applicability of two‐dimensional detector arrays in terms of sampling rate and detector size to verify scanned intensity‐modulated proton therapy plans

et al. 2020

View full text Add to dashboard Cite

The introduction of advanced treatment techniques in proton therapy, such as intensitymodulated proton therapy, leads to an increased need for patient-specific quality assurance, especially an accurate treatment plan verification becomes inevitable. In this study, signal theoretical analysis of dose distributions in scanned proton therapy is performed to investigate the feasibility and limits of two-dimensional (2D) detector arrays for treatment plan verification. Methods: 2D detector arrays are characterized by two main aspects: the distance between the single detectors on the array or the sampling frequency; and the lateral response functions of a single detector. The analysis is based on single spots, reference fields and on measured and calculated dose distributions of typical intensity-modulated proton therapy treatment plans with and without range shifter. Measurements were performed with Gafchromic EBT3 films (Ashland Speciality Ingredients G.P., Bridgewater, NJ, USA), the MatriXX PT detector array (IBA Dosimetry, Schwarzenbruck, Germany) and the OCTAVIUS detector array 1500XDR (PTW-Freiburg, Germany) at an IBA Proteus PLUS proton therapy system (Ion Beam Applications, Louvain-la-Neuve, Belgium). Dose calculations were performed with the treatment planning system RayStation 6 or 8 (RaySearch Laboratories, Sweden). Results: The Fourier analysis of the data of the treatment planning system and film measurements show maximum frequencies of 0.06/mm for the plan with range shifter and 0.083/mm for the plan without range shifter. According to the Nyquist theorem, this corresponds to minimum required sampling distances of 8.3 and 6 mm, respectively. By comparison, the sampling distances of the arrays of 7.6 mm (MatriXX PT) and 7.1 mm (OD1500XDR) are sufficient to reconstruct the dose distributions adequately from measurements if range shifters are used, whereas some fields of the plans without range shifter violated the Nyquist requirement. The lateral dose response functions of the single detectors within the arrays have clearly higher frequencies than the treatment plans and thus the volume effect only slightly influences the measurements. Consequently, the array measurements show high gamma passing rates with at least 96 % and a good agreement between the investigated line profiles. Conclusion: The results indicate that the detector dimensions and sampling distances of the arrays are in most studied cases adequate not to substantially influence the measurement process when they are used for analyzing typical intensity-modulated proton therapy treatment plans. Nevertheless, clinical conditions have been identified, for instance treatment plans without range shifter, under which the Nyquist theorem is violated such that a full representation of the dose distributions with the measurements is not feasible. In these cases, analysis of measurements is limited to pointwise comparisons.

show abstract

“…The DQA‐3 has been adapted for use in both uniform scanning proton beam and PBS systems. Two‐dimensional silicon and ionization chamber detector arrays, such as the Matrixx (IBA Dosimetry GmbH, Schwarzenbruck, Germany), have been used for daily PBS QA . The Centre for Proton Therapy at the Paul Scherrer Institute has an entirely in‐house developed phantom capable of performing comprehensive daily PBS QA .…”

Section: Introductionmentioning

confidence: 99%