Use of parallel-plate ionization chambers in reference dosimetry of NOVAC and LIAC®mobile electron linear accelerators for intraoperative radiotherapy: a multi-center survey

2017 ◽  
Vol 44 (1) ◽  
pp. 321-332 ◽  
Author(s):  
Paolo Scalchi ◽  
Alessia Ciccotelli ◽  
Giuseppe Felici ◽  
Assunta Petrucci ◽  
Raffaella Massafra ◽  
...  
Keyword(s):  
Parallel Plate ◽  
Intraoperative Radiotherapy ◽  
Linear Accelerators ◽  
Ionization Chambers ◽  
Mobile Electron

Experimental determination of fluence perturbation factors for five parallel-plate ionization chambers

1993 ◽  
Vol 20 (2) ◽  
pp. 331-335 ◽  
Author(s):  
Franca T. Kuchnir ◽  
Chester S. Reft
Keyword(s):  
Experimental Determination ◽  
Parallel Plate ◽  
Ionization Chambers

scholarly journals Economic Evaluation of the Mobile Electron Accelerator for Intraoperative Radiotherapy in Patients with Breast Cancer

2018 ◽  
Vol 21 ◽  
pp. S33
Author(s):  
H Soto-Molina ◽  
Y Escobar Juárez ◽  
K Sanchez-Trejo
Keyword(s):  
Breast Cancer ◽  
Economic Evaluation ◽  
Electron Accelerator ◽  
Intraoperative Radiotherapy ◽  
Mobile Electron

A linear-quadratic fit for saturation curves obtained under continuous irradiation of parallel-plate ionization chambers

1987 ◽  
Vol 14 (3) ◽  
pp. 359-364 ◽  
Author(s):  
B. G. Fallone ◽  
J. A. Bencomo
Keyword(s):  
Parallel Plate ◽  
Linear Quadratic ◽  
Ionization Chambers ◽  
Continuous Irradiation

Beam quality conversion factors for parallel-plate ionization chambers in MV photon beams

2012 ◽  
Vol 39 (3) ◽  
pp. 1618-1631 ◽  
Author(s):  
B. R. Muir ◽  
M. R. McEwen ◽  
D. W. O. Rogers
Keyword(s):  
Parallel Plate ◽  
Beam Quality ◽  
Photon Beams ◽  
Ionization Chambers ◽  
Conversion Factors

scholarly journals Intraoperative Full-Dose of Partial Breast Irradiation with Electrons Delivered by Standard Linear Accelerators for Early Breast Cancer

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Alfredo Carlos S. D. Barros ◽  
Samir A. Hanna ◽  
Heloísa A. Carvalho ◽  
Eduardo Martella ◽  
Felipe Eduardo M. Andrade ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Ductal Carcinoma ◽  
Intraoperative Radiotherapy ◽  
Distant Metastases ◽  
Target Volume ◽  
Incidence Rates ◽  
Partial Breast Irradiation ◽  
Linear Accelerators ◽  
Cosmetic Results ◽  
Standard Linear

Purpose. To assess feasibility, efficacy, toxicity, and cosmetic results of intraoperative radiotherapy (IORT) with electrons delivered by standard linear accelerators (Linacs) during breast conserving surgeries for early infiltrating breast cancer (BC) treatment.Materials and Methods. A total of 152 patients with invasive ductal carcinoma (T≤3.0 cm) at low risk for local relapses were treated. All had unicentric lesions by imaging methods and negative sentinel node. After a wide local excision, 21 Gy were delivered on the parenchyma target volume with electron beams. Local recurrences (LR), survival, toxicity, and cosmetic outcomes were analyzed.Results. The median age was 58.3 years (range 40–85); median follow-up was 50.7 months (range 12–101.5). There were 5 cases with LR, 2 cases with distant metastases, and 2 cases with deaths related to BC. The cumulative incidence rates of LR, distant metastases, and BC death were 3.2%, 1.5%, and 1.5%, respectively. Complications were rare, and the cosmetic results were excellent or good in most of the patients.Conclusions. IORT with electrons delivered by standard Linacs is feasible, efficient, and well tolerated and seems to be beneficial for selected patients with early infiltrating BC.

scholarly journals Quality Assurance of External Beam Radiotherapy and Results of Participation in IAEA/WHO TLD Inter-comparison program for Radiotherapy Level Dosimetry at Khwaja Yunus Ali Medical College & Hospital in Bangladesh

KYAMC Journal ◽  
2019 ◽  
Vol 10 (3) ◽  
pp. 147-151
Author(s):  
Meher Nigar Sharmin ◽  
Deepak Shankar Ray ◽  
Md Abdul Bari ◽  
Md Nazim Uddin ◽  
Md Shakilur Rahman
Keyword(s):  
Quality Assurance ◽  
External Beam Radiotherapy ◽  
Calibration Coefficient ◽  
Individual Treatment ◽  
Linear Accelerators ◽  
Ionization Chambers ◽  
College Hospital ◽  
Medical College ◽  
Depth Dose ◽  
Beam Output

Background: The outcome of the radiotherapy is highly dependent on how precisely dose is delivered to the tumor and should not exceed±5% of the prescribed dose including all types of uncertainties involved in the treatment procedure. Objectives: This manuscript describes the comprehensive Quality Assurance (QA) program for two linear accelerators by ensuring Percentage Depth Dose (PDD), Quality Index (QI), Beam Flatness and Symmetry, and beam output consistency at Khwaja Yunus Ali Medical College and Hospital, Sirajganj, Bangladesh. The program is designed according to the policy of the center and by the guidelines of Bangladesh Atomic Energy Regulatory Authority. Materials and Methods: The adopted QA procedure at our center included daily, weekly, monthly, and yearly checks, as well as individual treatment verifications and participation in IAEA/WHO TLD inter-comparison Program. Results: The results of the study showed reproducibility in all QA procedures with an average photon for monthly beam output 0.988±0.011, 0.989±0.010 and 1.005±0.006 for 4 MV, 6 MV and 15 MV respectively. The maximum variation of calibration factors of the chambers for last five years between the manufacturer values and the average calibration coefficient lies within -0.298 to 0.47% with an uncertainty of ±1.8% (k=1). The results of IAEA/WHO TLD inter-comparison program of dose measurement shows the ratio of IAEA to KYAMCH values was 1.009±0.018. Conclusion: The above result shows an excellent agreement of calibration coefficient of ionization chambers and dosimetry with the international standard system KYAMC Journal Vol. 10, No.-3, October 2019, Page 147-151

Perturbation effect of parallel-plate ionization chambers on buildup dose measurements in transverse magnetic fields

2019 ◽  
Vol 59 ◽  
pp. 112-116
Author(s):  
Takanori Matsuoka ◽  
Fujio Araki ◽  
Takeshi Ohno
Keyword(s):  
Magnetic Fields ◽  
Parallel Plate ◽  
Transverse Magnetic ◽  
Ionization Chambers ◽  
Dose Measurements ◽  
Perturbation Effect

scholarly journals Shielding assessment of a mobile electron accelerator for intraoperative radiotherapy

2001 ◽  
Vol 2 (3) ◽  
pp. 165-173 ◽  
Author(s):  
Jodi L. Daves ◽  
Michael D. Mills
Keyword(s):  
Electron Accelerator ◽  
Intraoperative Radiotherapy ◽  
Mobile Electron
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