The use of Pantherpix pixel detector in radiotherapy QA

Dudas, D.; Semmler, M.; Průša, P.; Neue, G.; Koniarová, Irena; Peterková, Kateřina; Gallus, P.; Koncek, Ondrej; Vrba, V.

doi:10.1016/j.ejmp.2021.01.072

Cited by 5 publications

(6 citation statements)

References 38 publications

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“…Introducing a relatively inexpensive and robust EPID even at the cost of lower spatial resolution would increase the quality of provided radiotherapy treatment in these countries. EPIDs based on detector PantherPix (pixel size 1 × 1 mm 2 ) are assumed to be a suitable choice for 60 Co treatment machines, where no EPID technology is currently available [6]. Moreover, it might also be utilized as a cheaper alternative for LINACs without any EPID.…”

Section: Introductionmentioning

confidence: 99%

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The effect of MV image spatial resolution on the patient positioning and patient specific QA

Dudas¹,

Koniarová²,

Průša³

et al. 2021

J. Inst.

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Electronic portal imaging device (EPID) is a common part of almost each radiotherapy treatment unit. It is a quick and simple tool for various clinical procedures, e.g. verification of patient positioning or patient specific QA. Currently available EPIDs have usually the spatial resolution below 0.5 mm. As EPIDs are not primarily designed for diagnostics, even lower spatial resolution might be acceptable. This work assesses the effect of MV image spatial resolution on clinical routines which employ the EPID and addresses the minimal technical requirements of such devices. The aim is to determine if EPIDs with poorer spatial resolution are able to reach the same clinical quality as currently used EPIDs. The effects of MV image spatial resolution on the imaging performance, patient positioning and patient specific QA were studied. The lower spatial resolution was simulated by manually downsampling the original images down to 4× poorer spatial resolution. The study includes an analysis of 96 images used for the patient positioning verification and 61 treatment field images used for the patient specific QA.

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Section: Introductionmentioning

confidence: 99%

“…The aim is to determine if EPIDs with a lower spatial resolution (e.g. based on detector PantherPix [6,7]) are able to reach the same clinical image quality as currently used EPIDs.…”

Section: Introductionmentioning

confidence: 99%

The effect of MV image spatial resolution on the patient positioning and patient specific QA

Dudas¹,

Koniarová²,

Průša³

et al. 2021

J. Inst.

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“…Such systems are required for future advancement of radiotherapy including automation of treatment without the need for pre-treatment patient specific IMRT QA [4]. Alternative detector principles for radiotherapy QA are under intense investigation, such as remote sensor detector arrays [12], topological detectors [14] or new pixelated detectors [15], as well as advanced evaluation of existing detectors such as for EPID [8][9][10][11] or IQM TM [6] which demonstrates the clinical necessity of a practical solution to real-time radiotherapy beam monitoring.…”

Section: Introductionmentioning

confidence: 99%

Strip detector array (SDA) for beam monitoring in radiotherapy: reconstruction of MLC parameters from multiple projections of flux

Hoegele¹,

Zygmanski²

2022

Biomed. Phys. Eng. Express

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Objective: In this paper we propose and investigate a new detector with multiple strip detector arrays (SDA) for monitoring MLC shaped x-ray beams for radiotherapy treatment. Approach: Each SDA measures 1D dose profiles equivalent to dose projections. The goal of such a detector is to determine individual MLC leaf positions as well as the Monitor Units (MU) per MLC segment during radiotherapy. In the present work we investigate an optimal SDA detector configuration and reconstruction algorithm. We determine the accuracy of SDA for different treatment sites (spine, pelvis, retroperitoneum, prostate, brain SRT, SRS, lung and head and neck). We perform a simulation study accounting for different type of MLC leaf positional errors: random MLC leaf, systematic for the whole leaf bank and systematic for an individual leaf. In a similar fashion, we also account for errors in Monitor Units per segment. Main results: We demonstrate that for a broad range of IMRT treatment plans a robust reconstruction of errors is achievable with only 3 projections (3 sets of SDA oriented at at 0◦, 45◦ and 135◦). The SDA is capable of capturing both systematic errors in leaf banks and individual leaves as well as random errors sufficient for practical clinical purposes. Significance: These features of the SDA detector makes it suitable for real-time Quality Control of MLC collimated linac output.

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“…Medipix, Pilatus, Pixie) [1] and others (e.g. PantherPix) [2,3] are about to be adopted. Particular medical applications, such as the transmission portal in-vivo dosimetry, require satisfactory detector performance following cumulative radiation doses of several hundreds of kGy in photon beams.…”

mentioning

confidence: 99%

“…Hence, radiation hardness studies of medical HPDs are highly relevant. The PantherPix detector (figure 1) was introduced in [2] and later investigated in [3]. It is a silicon photon-counting hybrid pixel detector designed specifically for radiotherapy dosimetry and imaging.…”

mentioning

confidence: 99%

Radiation hardness of PantherPix hybrid pixel detector

et al. 2021

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Hybrid pixel detectors (HPD) are nowadays well known and widely used in fundamental research, e.g. in high energy physics experiments. Over the last decade, segmented semiconductor detectors have also found use in medicine. The total doses received by medical radiation detectors often reach a significant level (up to several hundreds of kGy per decade), especially in applications such as transmission portal in-vivo dosimetry. Such doses might affect detector properties. Therefore, it is necessary to evaluate their performance after absorbing a significant radiation dose. PantherPix is a novel 2D hybrid pixel detector which is designed specifically for use in radiation therapy. As was concluded in earlier studies, it is suitable for radiotherapy quality assurance (QA) and portal dosimetry. In this paper, the PantherPix radiation hardness is investigated using a 60Co source. The dependence on dose of the full depletion voltage, leakage current, detector power consumption and detector response are provided. The PantherPix radiation tolerance has been shown to be adequate for common cumulative doses delivered to radiation detectors in radiotherapy over several decades and its performance has been verified for doses up to 3000 kGy.

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The use of Pantherpix pixel detector in radiotherapy QA

Cited by 5 publications

References 38 publications

The effect of MV image spatial resolution on the patient positioning and patient specific QA

The effect of MV image spatial resolution on the patient positioning and patient specific QA

Strip detector array (SDA) for beam monitoring in radiotherapy: reconstruction of MLC parameters from multiple projections of flux

Radiation hardness of PantherPix hybrid pixel detector

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