A5026876611- Advanced Radiotherapy Techniques
- Radiation Therapy and Dosimetry
- Radiation Dose and Imaging
- Radiation Detection and Scintillator Technologies
- Medical Imaging Techniques and Applications
- Glioma Diagnosis and Treatment
- Vascular Malformations Diagnosis and Treatment
- Advanced X-ray and CT Imaging
- Meningioma and schwannoma management
- Intracranial Aneurysms: Treatment and Complications
- Nuclear Physics and Applications
- Brain Metastases and Treatment
- Medical Image Segmentation Techniques
- Radiation Effects and Dosimetry
- Lung Cancer Diagnosis and Treatment
- Digital Radiography and Breast Imaging
- ECG Monitoring and Analysis
- Radiomics and Machine Learning in Medical Imaging
- Cardiac electrophysiology and arrhythmias
- Advances in Oncology and Radiotherapy
- Atomic and Subatomic Physics Research
- Neurofibromatosis and Schwannoma Cases
- Cardiomyopathy and Myosin Studies
- Nuclear reactor physics and engineering
- Spinal Fractures and Fixation Techniques
International Renal Research Institute of Vicenza
2010-2021
Ospedale San Bortolo
2003-2020
Ashland (United States)
2019-2020
American Association of Physicists in Medicine
2019-2020
UPMC Health System
2019-2020
Johns Hopkins University
2019-2020
Swedish Medical Center
2019-2020
Philips (Finland)
2020
John Wiley & Sons (United States)
2019-2020
Duke Medical Center
2020
The scope of this study was to determine a complete set correction factors for several detectors in static small photon fields two linear accelerators (linacs) and detectors.Measurements Monte Carlo (MC) commissioning were performed linacs, Siemens Primus Elekta Synergy. After having determined the source parameters that best fit measurements field specific output factors, profiles, tissue-phantom ratio, generalized version classical beam quality factor fields, k(Q(clin),Q(msr) )...
The scope of this study was to estimate total scatter factors ͑s c,p ͒ the three smallest collimators Cyberknife radiosurgery system ͑5-10 mm in diameter͒, combining experimental measurements and Monte Carlo simulation.Two microchambers, a diode, diamond detector were used collect data.The treatment head detectors simulated by means code order calculate correction for consistency check between measurement simulation.Results were: s ͑5 mm͒ = 0.677± 0.004, ͑7.5 0.820± 0.008, ͑10 0.871± all...
Monte Carlo (MC) simulation of dose to water and detector has been used calculate the correction factors needed for calibration output factor measurements on CyberKnife system. Reference field ionization chambers simulated were PTW 30006, Exradin A12, NE 2571 Farmer chambers, small volume 31014 31010. Correction found be 0.7%-0.9% larger than those determined from TRS-398 due mainly gradient across chamber cavity. For one microchamber where comparison was possible, 0.5% lower which is...
Small-field dosimetry used in advance treatment technologies poses challenges due to loss of lateral charged particle equilibrium (LCPE), occlusion the primary photon source, and limited choice suitable radiation detectors. These greatly influence dosimetric accuracy. Many high-profile incidents have demonstrated a poor understanding appropriate methodology for small-field dosimetry. are cause concern because use small fields various specialized techniques continues grow rapidly. Reference...
To present initial, short-term results obtained with an image-guided radiosurgery apparatus (CyberKnife; Accuray, Inc., Sunnyvale, CA) in a series of 199 benign intracranial meningiomas.Selection criteria included lesions unsuitable for surgery and/or remnants after partial surgical removal. All patients were either symptomatic harboring growing tumors. Ninety-nine tumors involved the cavernous sinus; 28 posterior fossa, petrous bone, or clivus; and 29 contact anterior optic pathways....
Purpose: Evaluate the ability of different dosimeters to correctly measure dosimetric parameters percentage depth dose (PDD), tissue‐maximum ratio (TMR), and off‐axis (OAR) in water for small fields. Methods: Monte Carlo (MC) simulations were used estimate variation several types microdetectors as a function distance from central axis PDD, TMR, OAR measurements. The enables one evaluate detector reproduce consequently determine whether it is necessary apply correction factors. correctness...
A previous study of the corrections needed for output factor measurements with CyberKnife system has been extended to include new diode detectors (IBA SFD and Exradin D1V), an air filled microchamber (Exradin CC01) a scintillation detector W1). The dependence on orientation (detector long axis parallel versus perpendicular beam axis) source distance (SDD) was evaluated these those in our study. diodes are found over-respond at smallest (5 mm) field size by 2.5% (D1V) 3.3% (SFD) 800 mm SDD,...
Monte Carlo simulation was used to calculate correction factors for output factor (OF), percentage depth-dose (PDD), and off-axis ratio (OAR) measurements with the CyberKnife M6 System. These include first such data InCise MLC. Simulated detectors diodes, air-filled microchambers, a synthetic microdiamond detector, point scintillator. Individual perturbation were also evaluated. OF corrections show similar trends previous studies. With 5 mm fixed collimator diode convert measured...
The dosimetry of the fields usually employed in radiosurgery requires use small detectors to measure Total Scatter Factor (Sc,p), Tissue Maximum Ratio (TMR), Percentage Depth Dose (PDD), and Off Axis (OAR). In this paper new dosimeters are investigated: a type radiochromic film, micro parallel-plate chamber (filled with both air tetramethylsilane, TMS), MOSFETs, TLD-800 microcubes. Their behavior has been compared response radiographic film values obtained BEAM Monte Carlo simulation....
ONE HUNDRED EIGHTY patients affected by cerebral arteriovenous malformations (AVMs) underwent radiosurgical treatment in our department. One hundred fifty-three have been treated with complete irradiation of the entire AVM nidus. In 27 (with large and/or three-dimensional irregular target volumes), only part nidus was covered a dose adequate for obliteration. Follow-up ranged from 88 to 1 months (mean, 43.1 mo). Angiographic control performed at 12, 24, and 36 until obliteration attained....
Purpose: To compare and evaluate different dosimetric techniques devices for the QA of VMAT plans created by two treatment planning systems (TPSs). Methods: A total 50 were optimized anatomical sites various complexities TPSs which use rather approaches to optimization. Dosimetric plan verifications performed both as part commissioning patient specific clinical treatments. Absolute point doses measured all a micro ion chamber inserted in dedicated water‐filled cylindrical phantom. Delivered...
A systematic study of the PTW microDiamond (MD) output factors (OF) is reported, aimed at clarifying its response in small fields and investigating suitability for field reference dosimetry. Ten MDs were calibrated under 60Co irradiation. OF measurements performed 6 MV photon beams by a CyberKnife M6, Varian DHX an Elekta Synergy linacs. Two silicon diodes E (Si-D) used comparison. The results obtained evaluated terms absorbed dose to water determination conditions measurements, compared...
The IAEA is currently coordinating a multi-year project to update the TRS-398 Code of Practice for dosimetry external beam radiotherapy based on standards absorbed dose water. One major aspect determination new quality correction factors, k Q , megavoltage photon beams consistent with developments in and technology since publication 2000. Specifically, all values must be on, or with, key data ICRU Report 90. Data sets obtained from Monte Carlo (MC) calculations by advanced users measurements...
The authors describe a method that utilizes an image-guided robotic radiosurgical apparatus (the CyberKnife) for treatment of cerebral arteriovenous malformations (AVMs). This procedure required the development original technique allows high degree automation.Angiographic images were imported into planning software by coregistering CT and 3D rotational angiography. nidus contour was delineated using contouring tools system. Functional MR imaging employed critical cortical regions, such as...
The purpose of this work is to compare the photon dose calculation a commercially available three‐dimensional (3D) treatment planning system based on collapsed cone convolution technique against BEAM, Monte Carlo code that allows detailed simulation radiotherapy accelerator. first part devoted commissioning BEAM for 6 MV beam and optimization linac description fit experimental data. This step also involves comparison with radiochromic film data an inhomogeneous phantom built simulate...
The dose released to the patient skin during a radiotherapy treatment is important when an organ at risk, or on contrary, included in target volume. Since most planning programs do not predict within several millimeters of body surface, it have method verify for who undergoing radiotherapy. A special type metal oxide semiconductors field‐effect transistors (MOSFET) was developed perform vivo dosimetry treatments. Water‐equivalent depth (WED), both manufacturing and sensor reproducibility,...
Spatial accuracy in extracranial radiosurgery is affected by organ motion. Motion tracking systems may be able to avoid PTV enlargement while preserving treatment times, however special attention needed when fiducial markers are used identify the target can move with respect organs at risk (OARs). Ten patients treated means of Synchrony system were taken into account. Sparing irradiated volume and complication probability estimated calculating plans a motion (Cyberknife Synchrony, Sunnyvale,...