1
|
Bui TNH, Large M, Poder J, Bucci J, Bianco E, Giampaolo RA, Rivetti A, Da Rocha Rolo M, Pastuovic Z, Corradino T, Pancheri L, Petasecca M. Preliminary Characterization of an Active CMOS Pad Detector for Tracking and Dosimetry in HDR Brachytherapy. Sensors (Basel) 2024; 24:692. [PMID: 38276383 PMCID: PMC10818778 DOI: 10.3390/s24020692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 01/15/2024] [Accepted: 01/18/2024] [Indexed: 01/27/2024]
Abstract
We assessed the accuracy of a prototype radiation detector with a built in CMOS amplifier for use in dosimetry for high dose rate brachytherapy. The detectors were fabricated on two substrates of epitaxial high resistivity silicon. The radiation detection performance of prototypes has been tested by ion beam induced charge (IBIC) microscopy using a 5.5 MeV alpha particle microbeam. We also carried out the HDR Ir-192 radiation source tracking at different depths and angular dose dependence in a water equivalent phantom. The detectors show sensitivities spanning from (5.8 ± 0.021) × 10-8 to (3.6 ± 0.14) × 10-8 nC Gy-1 mCi-1 mm-2. The depth variation of the dose is within 5% with that calculated by TG-43. Higher discrepancies are recorded for 2 mm and 7 mm depths due to the scattering of secondary particles and the perturbation of the radiation field induced in the ceramic/golden package. Dwell positions and dwell time are reconstructed within ±1 mm and 20 ms, respectively. The prototype detectors provide an unprecedented sensitivity thanks to its monolithic amplification stage. Future investigation of this technology will include the optimisation of the packaging technique.
Collapse
Affiliation(s)
- Thi Ngoc Hang Bui
- Centre for Medical Radiation Physics, University of Wollongong, Wollongong, NSW 2522, Australia; (T.N.H.B.); (M.L.); (J.P.); (J.B.)
| | - Matthew Large
- Centre for Medical Radiation Physics, University of Wollongong, Wollongong, NSW 2522, Australia; (T.N.H.B.); (M.L.); (J.P.); (J.B.)
| | - Joel Poder
- Centre for Medical Radiation Physics, University of Wollongong, Wollongong, NSW 2522, Australia; (T.N.H.B.); (M.L.); (J.P.); (J.B.)
- St George Cancer Care Centre, Kogarah, NSW 2217, Australia
- School of Physics, University of Sydney, Camperdown, NSW 2050, Australia
| | - Joseph Bucci
- Centre for Medical Radiation Physics, University of Wollongong, Wollongong, NSW 2522, Australia; (T.N.H.B.); (M.L.); (J.P.); (J.B.)
- St George Cancer Care Centre, Kogarah, NSW 2217, Australia
| | - Edoardo Bianco
- Department of Electronics and Telecommunications, Polytechnic University of Turin, 10129 Turin, Italy; (E.B.); (R.A.G.)
- Istituto Nazionale di Fisica Nucleare—Section of Turin, 10125 Turin, Italy; (A.R.); (M.D.R.R.)
| | - Raffaele Aaron Giampaolo
- Department of Electronics and Telecommunications, Polytechnic University of Turin, 10129 Turin, Italy; (E.B.); (R.A.G.)
- Istituto Nazionale di Fisica Nucleare—Section of Turin, 10125 Turin, Italy; (A.R.); (M.D.R.R.)
| | - Angelo Rivetti
- Istituto Nazionale di Fisica Nucleare—Section of Turin, 10125 Turin, Italy; (A.R.); (M.D.R.R.)
| | - Manuel Da Rocha Rolo
- Istituto Nazionale di Fisica Nucleare—Section of Turin, 10125 Turin, Italy; (A.R.); (M.D.R.R.)
| | - Zeljko Pastuovic
- Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia;
| | - Thomas Corradino
- Department of Industrial Engineering, University of Trento, 38123 Trento, Italy (L.P.)
- Trento Institute for Fundamental Physics and Applications, Istituto Nazionale di Fisica Nucleare, 38123 Trento, Italy
| | - Lucio Pancheri
- Department of Industrial Engineering, University of Trento, 38123 Trento, Italy (L.P.)
- Trento Institute for Fundamental Physics and Applications, Istituto Nazionale di Fisica Nucleare, 38123 Trento, Italy
| | - Marco Petasecca
- Centre for Medical Radiation Physics, University of Wollongong, Wollongong, NSW 2522, Australia; (T.N.H.B.); (M.L.); (J.P.); (J.B.)
| |
Collapse
|
2
|
Okamoto H, Iijima K, Chiba T, Takemori M, Nakayam H, Fujii K, Kon M, Mikasa S, Nakaichi T, Urago Y, Aikawa A, Katsuta S, Nakamura S, Igaki H. Technical note: Analysis of brachytherapy source movement by high‐speed camera. Med Phys 2022; 49:4804-4811. [DOI: 10.1002/mp.15601] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 03/07/2022] [Accepted: 03/07/2022] [Indexed: 11/11/2022] Open
Affiliation(s)
- Hiroyuki Okamoto
- Radiation Safety and Quality Assurance Division National Cancer Center Hospital Tokyo 104‐0045 Japan
| | - Kotaro Iijima
- Radiation Safety and Quality Assurance Division National Cancer Center Hospital Tokyo 104‐0045 Japan
| | - Takahito Chiba
- Radiation Safety and Quality Assurance Division National Cancer Center Hospital Tokyo 104‐0045 Japan
| | - Mihiro Takemori
- Radiation Safety and Quality Assurance Division National Cancer Center Hospital Tokyo 104‐0045 Japan
| | - Hiroki Nakayam
- Radiation Safety and Quality Assurance Division National Cancer Center Hospital Tokyo 104‐0045 Japan
| | - Kyohei Fujii
- Radiation Safety and Quality Assurance Division National Cancer Center Hospital Tokyo 104‐0045 Japan
| | - Mitsuhiro Kon
- Department of Radiological Technology National Cancer Center Hospital Tokyo 104‐0045 Japan
| | - Shohei Mikasa
- Radiation Safety and Quality Assurance Division National Cancer Center Hospital Tokyo 104‐0045 Japan
| | - Tetsu Nakaichi
- Radiation Safety and Quality Assurance Division National Cancer Center Hospital Tokyo 104‐0045 Japan
| | - Yuka Urago
- Radiation Safety and Quality Assurance Division National Cancer Center Hospital Tokyo 104‐0045 Japan
| | - Ako Aikawa
- Department of Radiological Technology National Cancer Center Hospital Tokyo 104‐0045 Japan
| | - Shyouichi Katsuta
- Department of Radiological Technology National Cancer Center Hospital Tokyo 104‐0045 Japan
| | - Satoshi Nakamura
- Radiation Safety and Quality Assurance Division National Cancer Center Hospital Tokyo 104‐0045 Japan
| | - Hiroshi Igaki
- Department of Radiation Oncology National Cancer Center Hospital Tokyo 104‐0045 Japan
| |
Collapse
|
3
|
Fonseca GP, Voncken R, Hermans J, Verhaegen F. Time-resolved QA and brachytherapy applicator commissioning: Towards the clinical implementation. Brachytherapy 2021; 21:128-137. [PMID: 34657801 DOI: 10.1016/j.brachy.2021.08.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 07/09/2021] [Accepted: 08/09/2021] [Indexed: 01/22/2023]
Abstract
PURPOSE Brachytherapy has a busy workflow relying on manual steps to ensure accurate delivery of the treatment. Systematic treatment errors have been reported due to faulty equipment, inadequate quality assurance (QA) and applicator commissioning methods. This study describes the use of a novel method, the Iridium Imaging System for QA (IrIS - QA), to automate and improve the applicator commissioning for HDR 192Ir brachytherapy. METHODS AND MATERIALS A 3D printed holder attached to an Imaging Panel (IP) has been developed to: (1) acquire a high-definition projection of the applicator using the gamma rays of the 192Ir source for imaging; (2) Track the source within the applicator verifying in a time-resolved manner the dwell positions and dwell times with a high resolution. Results obtained for two applicator models are described in this manuscript. RESULTS IrIS-QA is capable of measuring the dwell times with an accuracy better than 0.1 s and interdwell distances with submillimetre precision. The applicators tested in the study showed good agreement between planned and delivered dwell times and positions, with mean and maximum dwell position deviations below 0.5 mm and 1.3 mm, respectively. Dwell time measurements showed agreement superior to 0.05 s except for the first dwell position for which up to 0.15 s differences were observed. CONCLUSIONS IrIS-QA is a compact system that includes many features necessary to improve the accuracy and efficiency of applicator commissioning and daily QA. No commercial system exists with similar capabilities. IrIS-QA is intended to replace current clinical procedures using film dosimetry.
Collapse
Affiliation(s)
- Gabriel P Fonseca
- Department of Radiation Oncology (MAASTRO), GROW School for Oncology and Developmental Biology, Maastricht University Medical Centre, Maastricht, the Netherlands.
| | - Robert Voncken
- Department of Radiation Oncology (MAASTRO), GROW School for Oncology and Developmental Biology, Maastricht University Medical Centre, Maastricht, the Netherlands
| | - Joep Hermans
- Department of Radiation Oncology (MAASTRO), GROW School for Oncology and Developmental Biology, Maastricht University Medical Centre, Maastricht, the Netherlands
| | - Frank Verhaegen
- Department of Radiation Oncology (MAASTRO), GROW School for Oncology and Developmental Biology, Maastricht University Medical Centre, Maastricht, the Netherlands
| |
Collapse
|
4
|
Wilby S, Palmer A, Polak W, Bucchi A. A review of brachytherapy physical phantoms developed over the last 20 years: clinical purpose and future requirements. J Contemp Brachytherapy 2021; 13:101-15. [PMID: 34025743 DOI: 10.5114/jcb.2021.103593] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Accepted: 11/13/2020] [Indexed: 12/04/2022] Open
Abstract
Within the brachytherapy community, many phantoms are constructed in-house, and less commercial development is observed as compared to the field of external beam. Computational or virtual phantom design has seen considerable growth; however, physical phantoms are beneficial for brachytherapy, in which quality is dependent on physical processes, such as accuracy of source placement. Focusing on the design of physical phantoms, this review paper presents a summary of brachytherapy specific phantoms in published journal articles over the last twenty years (January 1, 2000 – December 31, 2019). The papers were analyzed and tabulated by their primary clinical purpose, which was deduced from their associated publications. A substantial body of work has been published on phantom designs from the brachytherapy community, but a standardized method of reporting technical aspects of the phantoms is lacking. In-house phantom development demonstrates an increasing interest in magnetic resonance (MR) tissue mimicking materials, which is not yet reflected in commercial phantoms available for brachytherapy. The evaluation of phantom design provides insight into the way, in which brachytherapy practice has changed over time, and demonstrates the customised and broad nature of treatments offered.
Collapse
|
5
|
Jia M, Kim TJ, Yang Y, Xing L, Jean PD, Grafil E, Jenkins CH, Fahimian BP. Automated multi-parameter high-dose-rate brachytherapy quality assurance via radioluminescence imaging. Phys Med Biol 2020; 65:225005. [PMID: 33200751 DOI: 10.1088/1361-6560/abb570] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The purpose of this study is to leverage radioluminescence imaging for the development of an automated high-dose-rate (HDR) brachytherapy quality assurance (QA) system that enables simultaneous measurements of dwell position, dwell time, wire velocity, and relative source strength in a single test. The system consists of a radioluminescence phosphor sheet (a mixture of Gd2O2S:Tb and PDMS) positioned atop a HDR needle applicator, a complementary metal-oxide-semiconductor digital camera used to capture the emitted radioluminescence signals from the scintillator sheet, and an in-house graphical user interface for signal processing. The signal processing was used to extract source intensity, location, and elapsed time, yielding the final measurements on dwell position, dwell time, and wire velocity. The source strength relative to the well chamber calibration (in unit of Air-Kerma strength, Sk ) is measured by establishing a calibration curve that correlates Sk with the detector response. Validation experiments are performed using three customized treatment plans. With these plans, the dwell position and dwell time are verified for a range of 110.0 cm-117.5 cm and 2 s-16 s, respectively, and the linear correlation with Sk is demonstrated for the source strength varying between 28 348 U (cGy cm2 h-1) and 41 906 U. The wire velocity, i.e. the speed of the radioactive source averaged over the distance in between dwell positions, is calculated for various distances ranging from 5 mm to 50 mm. Results show that the mean deviations of the measured dwell position and dwell time are 0.1 mm (range from 0 to 0.2 mm) and 32.5 ms (range from 0 to 60.0 ms) with respect to the planned values, respectively, and the system response is highly linear with Sk ( R2 = 0.998). Moreover, the measured wire velocities are comparable to previously reported values. Benefitting from the compact hardware design and image processing algorithms, the system provides a practical, reliable, and comprehensive solution for HDR QA.
Collapse
Affiliation(s)
- Mengyu Jia
- Department of Radiation Oncology, Stanford University, Stanford, CA 94305, United States of America. equal contribution
| | | | | | | | | | | | | | | |
Collapse
|
6
|
Yogo K, Matsushita A, Tatsuno Y, Shimo T, Hirota S, Nozawa M, Ozawa S, Ishiyama H, Yasuda H, Nagata Y, Hayakawa K. Imaging Cherenkov emission for quality assurance of high-dose-rate brachytherapy. Sci Rep 2020; 10:3572. [PMID: 32108157 DOI: 10.1038/s41598-020-60519-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2019] [Accepted: 02/12/2020] [Indexed: 11/26/2022] Open
Abstract
With advances in high-dose-rate (HDR) brachytherapy, the importance of quality assurance (QA) is increasing to ensure safe delivery of the treatment by measuring dose distribution and positioning the source with much closer intervals for highly active sources. However, conventional QA is time-consuming, involving the use of several different measurement tools. Here, we developed simple QA method for HDR brachytherapy based on the imaging of Cherenkov emission and evaluated its performance. Light emission from pure water irradiated by an 192Ir γ-ray source was captured using a charge-coupled device camera. Monte Carlo calculations showed that the observed light was primarily Cherenkov emissions produced by Compton-scattered electrons from the γ-rays. The uncorrected Cherenkov light distribution, which was 5% on average except near the source (within 7 mm from the centre), agreed with the dose distribution calculated using the treatment planning system. The accuracy was attributed to isotropic radiation and short-range Compton electrons. The source positional interval, as measured from the light images, was comparable to the expected intervals, yielding spatial resolution similar to that permitted by conventional film measurements. The method should be highly suitable for quick and easy QA investigations of HDR brachytherapy as it allows simultaneous measurements of dose distribution, source strength, and source position using a single image.
Collapse
|
7
|
Poder J, Cutajar D, Guatelli S, Petasecca M, Howie A, Bucci J, Carrara M, Rosenfeld A. A Monte Carlo study on the feasibility of real-time in vivo source tracking during ultrasound based HDR prostate brachytherapy treatments. Phys Med 2019; 59:30-36. [DOI: 10.1016/j.ejmp.2019.02.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Revised: 12/14/2018] [Accepted: 02/14/2019] [Indexed: 10/27/2022] Open
|
8
|
Romanyukha A, Carrara M, Mazzeo D, Tenconi C, Al-Salmani T, Poder J, Cutajar D, Fuduli I, Petasecca M, Bucci J, Cerrotta A, Pappalardi B, Piccolo F, Pignoli E, Rosenfeld A. An innovative gynecological HDR brachytherapy applicator system for treatment delivery and real-time verification. Phys Med 2019; 59:151-157. [DOI: 10.1016/j.ejmp.2019.03.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 02/27/2019] [Accepted: 03/01/2019] [Indexed: 10/27/2022] Open
|
9
|
Krause F, Risske F, Bohn S, Delaperriere M, Dunst J, Siebert FA. End-to-end test for computed tomography-based high-dose-rate brachytherapy. J Contemp Brachytherapy 2018; 10:551-8. [PMID: 30662478 DOI: 10.5114/jcb.2018.81026] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Accepted: 11/19/2018] [Indexed: 11/29/2022] Open
Abstract
Purpose One of the important developments in brachytherapy in recent years has been the clinical implementation of complex modern technical procedures. Today, 3D-imaging has become the standard procedure and it is used for contouring and precise position determination and reconstruction of used brachytherapy applicators. Treatment planning is performed on the basis of these imaging methods, followed by data transfer to the afterloading device. Therefore, checking the entire treatment chain is of high importance. In this work, we describe an end-to-end test for computed tomography (CT)-based brachytherapy with an high-dose-rate (HDR) afterloading device, which fulfills the recommendation of the German radiation-protection-commission. Material and methods The treatment chain consists of a SOMATOM S64 CT scanner (Siemens Medical), the treatment planning system (TPS) BrachyVision v.13.7 (VMS), which utilizes the calculation formalism TG-43 and the Acuros algorithm v. 1.5.0 (VMS) as well as GammaMedplus HDR afterloader (VMS) using an Ir-192 source. Measurement setups for common brachytherapy applicators are defined in a water phantom, and the required PMMA applicator holders are developed. These setups are scanned with the CT and the data is imported into the TPS. Computed TPS reference dose values for significant points located on the side of the applicator are compared with dose measurements performed with a PinPoint 3D chamber 31016 (PTW Freiburg). Results The deviations for the end-to-end test between computed and measured values are shown to be ≤ 5%, when using an implant needle or vaginal cylinder. Furthermore, it can be demonstrated that the test procedure provides reproducible results, while repositioning the applicators without carrying out a new CT-scan. Conclusions The end-to-end test presented allows a practice-oriented realization for checking the whole treatment chain for HDR afterloading technique and CT-imaging. The presented phantom seems feasible for performing periodic system checks as well as to verify newly introduced brachytherapy techniques with sufficient accuracy.
Collapse
|
10
|
Pittet P, Jalade P, Gindraux L, Guiral P, Wang R, Galvan JM, Lu GN. DoRGaN: Development of Quality Assurance and Quality Control Systems for High Dose Rate Brachytherapy Based on GaN Dosimetry Probes. Ing Rech Biomed 2018. [DOI: 10.1016/j.irbm.2018.04.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
11
|
Poder J, Cutajar D, Guatelli S, Petasecca M, Howie A, Bucci J, Rosenfeld A. HDR brachytherapy in vivo source position verification using a 2D diode array: A Monte Carlo study. J Appl Clin Med Phys 2018; 19:163-172. [PMID: 29855128 PMCID: PMC6036394 DOI: 10.1002/acm2.12360] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2018] [Revised: 03/21/2018] [Accepted: 04/18/2018] [Indexed: 11/23/2022] Open
Abstract
PURPOSE This study aims to assess the accuracy of source position verification during high-dose rate (HDR) prostate brachytherapy using a novel, in-house developed two-dimensional (2D) diode array (the Magic Plate), embedded exactly below the patient within a carbon fiber couch. The effect of tissue inhomogeneities on source localization accuracy is examined. METHOD Monte Carlo (MC) simulations of 12 source positions from a HDR prostate brachytherapy treatment were performed using the Geant4 toolkit. An Ir-192 Flexisource (Isodose Control, Veenendaal, the Netherlands) was simulated inside a voxelized patient geometry, and the dose deposited in each detector of the Magic Plate evaluated. The dose deposited in each detector was then used to localize the source position using a proprietary reconstruction algorithm. RESULTS The accuracy of source position verification using the Magic Plate embedded in the patient couch was found to be affected by the tissue inhomogeneities within the patient, with an average difference of 2.1 ± 0.8 mm (k = 1) between the Magic Plate predicted and known source positions. Recalculation of the simulations with all voxels assigned a density of water improved this verification accuracy to within 1 mm. CONCLUSION Source position verification using the Magic Plate during a HDR prostate brachytherapy treatment was examined using MC simulations. In a homogenous geometry (water), the Magic Plate was able to localize the source to within 1 mm, however, the verification accuracy was negatively affected by inhomogeneities; this can be corrected for by using density information obtained from CT, making the proposed tool attractive for use as a real-time in vivo quality assurance (QA) device in HDR brachytherapy for prostate cancer.
Collapse
Affiliation(s)
- Joel Poder
- Centre of Medical Radiation PhysicsUniversity of WollongongWollongongNSWAustralia
- St George Hospital Cancer Care CentreKogarahNSWAustralia
| | - Dean Cutajar
- Centre of Medical Radiation PhysicsUniversity of WollongongWollongongNSWAustralia
- St George Hospital Cancer Care CentreKogarahNSWAustralia
| | - Susanna Guatelli
- Centre of Medical Radiation PhysicsUniversity of WollongongWollongongNSWAustralia
| | - Marco Petasecca
- Centre of Medical Radiation PhysicsUniversity of WollongongWollongongNSWAustralia
| | - Andrew Howie
- St George Hospital Cancer Care CentreKogarahNSWAustralia
| | - Joseph Bucci
- St George Hospital Cancer Care CentreKogarahNSWAustralia
| | - Anatoly Rosenfeld
- Centre of Medical Radiation PhysicsUniversity of WollongongWollongongNSWAustralia
| |
Collapse
|
12
|
Guiral P, Wang R, Galvan JM, Lu GN, Jalade P, Ribouton J, Pittet P. Gynecological applicator instrumented with GaN dosimetric probes for HDR brachytherapy. RADIAT MEAS 2017. [DOI: 10.1016/j.radmeas.2017.03.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
13
|
Okamoto H, Nakamura S, Nishioka S, Iijima K, Wakita A, Abe Y, Tohyama N, Kawamura S, Minemura T, Itami J. Independent assessment of source position for gynecological applicator in high-dose-rate brachytherapy. J Contemp Brachytherapy 2017; 9:477-86. [PMID: 29204169 DOI: 10.5114/jcb.2017.70952] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2017] [Accepted: 09/05/2017] [Indexed: 11/17/2022] Open
Abstract
Purpose The aim of this study is to describe a phantom designed for independent examination of a source position in brachytherapy that is suitable for inclusion in an external auditing program. Material and methods We developed a phantom that has a special design and a simple mechanism, capable of firmly fixing a radiochromic film and tandem-ovoid applicators to assess discrepancies in source positions between the measurements and treatment planning system (TPS). Three tests were conducted: 1) reproducibility of the source positions (n = 5); 2) source movements inside the applicator tube; 3) changing source position by changing curvature of the transfer tubes. In addition, as a trial study, the phantom was mailed to 12 institutions, and 23 trial data sets were examined. The source displacement ΔX and ΔY (reference = TPS) were expressed according to the coordinates, in which the positive direction on the X-axis corresponds to the external side of the applicator perpendicular to source transfer direction Y-axis. Results Test 1: The 1σ fell within 1 mm irrespective of the dwell positions. Test 2: ΔX were greater around the tip of the applicator owing to the source cable. Test 3: All of the source position changes fell within 1 mm. For postal audit, the mean and 1.96σ in ΔX were 0.8 and 0.8 mm, respectively. Almost all data were located within a positive region along the X-axis due to the source cable. The mean and 1.96σ in ΔY were 0.3 and 1.6 mm, respectively. The variance in ΔY was greater than that in ΔX, and large uncertainties exist in the determination of the first dwell position. The 95% confidence limit was 2.1 mm. Conclusions In HDR brachytherapy, an effectiveness of independent source position assessment could be demonstrated. The 95% confidence limit was 2.1 mm for a tandem-ovoids applicator.
Collapse
|
14
|
Carrara M, Cutajar D, Alnaghy S, Espinoza A, Romanyukha A, Presilla S, Tenconi C, Cerrotta A, Fallai C, Safavi-Naeini M, Petasecca M, Kejda A, Lerch M, Corde S, Jackson M, Howie A, Bucci J, Rosenfeld AB. Semiconductor real-time quality assurance dosimetry in brachytherapy. Brachytherapy 2018; 17:133-45. [PMID: 28964727 DOI: 10.1016/j.brachy.2017.08.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Revised: 08/22/2017] [Accepted: 08/28/2017] [Indexed: 11/23/2022]
Abstract
With the increase in complexity of brachytherapy treatments, there has been a demand for the development of sophisticated devices for delivery verification. The Centre for Medical Radiation Physics (CMRP), University of Wollongong, has demonstrated the applicability of semiconductor devices to provide cost-effective real-time quality assurance for a wide range of brachytherapy treatment modalities. Semiconductor devices have shown great promise to the future of pretreatment and in vivo quality assurance in a wide range of brachytherapy treatments, from high-dose-rate (HDR) prostate procedures to eye plaque treatments. The aim of this article is to give an insight into several semiconductor-based dosimetry instruments developed by the CMRP. Applications of these instruments are provided for breast and rectal wall in vivo dosimetry in HDR brachytherapy, urethral in vivo dosimetry in prostate low-dose-rate (LDR) brachytherapy, quality assurance of HDR brachytherapy afterloaders, HDR pretreatment plan verification, and real-time verification of LDR and HDR source dwell positions.
Collapse
|
15
|
Guiral P, Ribouton J, Jalade P, Wang R, Galvan JM, Lu GN, Pittet P, Rivoire A, Gindraux L. Design and testing of a phantom and instrumented gynecological applicator based on GaN dosimeter for use in high dose rate brachytherapy quality assurance. Med Phys 2016; 43:5240. [DOI: 10.1118/1.4961393] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
16
|
Safavi-Naeini M, Han Z, Alnaghy S, Cutajar D, Petasecca M, Lerch MLF, Franklin DR, Bucci J, Carrara M, Zaider M, Rosenfeld AB. BrachyView, a novel in-body imaging system for HDR prostate brachytherapy: Experimental evaluation. Med Phys 2015; 42:7098-107. [DOI: 10.1118/1.4935866] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
17
|
Espinoza A, Petasecca M, Cutajar D, Fuduli I, Howie A, Bucci J, Corde S, Jackson M, Zaider M, Lerch MLF, Rosenfeld AB. Pretreatment verification of high dose rate brachytherapy plans using the ‘magic phantom’ system. Biomed Phys Eng Express 2015. [DOI: 10.1088/2057-1976/1/2/025201] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|