Wall-correction and absorbed-dose conversion factors for Fricke dosimetry: Monte Carlo calculations and measurements

1993 ◽  
Vol 20 (2) ◽  
pp. 283-292 ◽  
Author(s):  
Chang-ming Ma ◽  
D. W. O. Rogers ◽  
K. R. Shortt ◽  
C. K. Ross ◽  
A. E. Nahum ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Absorbed Dose ◽  
Conversion Factors ◽  
Monte Carlo Calculations

Gamma-ray Dosimetry of Internal Emitters II: Monte Carlo Calculations of Absorbed Dose from Uniform Sources

1965 ◽  
Vol 38 (451) ◽  
pp. 541-544 ◽  
Author(s):  
William H. Ellett ◽  
Arthur B. Callahan ◽  
Gordon L. Brownell
Keyword(s):  
Monte Carlo ◽  
Gamma Ray ◽  
Absorbed Dose ◽  
Monte Carlo Calculations

Conversion Factors between Energy Imparted to the Patient and Air Collision Kerma Integrated over Beam Area in Pediatric Radiology

1993 ◽  
Vol 34 (1) ◽  
pp. 92-98 ◽  
Author(s):  
J. Persliden ◽  
M. Sandborg
Keyword(s):  
Monte Carlo ◽  
Soft Tissue ◽  
Conversion Factor ◽  
Field Size ◽  
Conversion Factors ◽  
X Ray ◽  
Monte Carlo Calculations ◽  
Tissue Phantoms ◽  
Tube Potential ◽  
Pediatric Radiography

Conversion factors between the energy imparted to the patient in pediatric radiography and air collision kerma integrated over beam area are presented. The values have been derived from Monte Carlo calculations in soft tissue phantoms and extend results published earlier to cover children from early infancy to the age of 15 years. Variations related to phantom size as well as to focus-phantom distance, radiation field size, orientation of view (a.p., lateral), tube potential, and beam filtration are given. We show that the conversion factor increases with increasing half-value layer of the X-ray beam and the anterioposterior width of the simulated child. Increasing the focus-phantom distance increases the conversion factor, while increasing the field size decreases the factors due to more scattered radiation escaping laterally from the phantom.

Monte Carlo calculations of the absorbed dose and energy dependence of plastic scintillators

2005 ◽  
Vol 32 (5) ◽  
pp. 1265-1269 ◽  
Author(s):  
A. Sam Beddar ◽  
Tina Marie Briere ◽  
Firas A. Mourtada ◽  
Oleg N. Vassiliev ◽  
H. Helen Liu ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Energy Dependence ◽  
Absorbed Dose ◽  
Monte Carlo Calculations ◽  
Plastic Scintillators

scholarly journals Monte Carlo calculations and measurements of absorbed dose per monitor unit for the treatment of uveal melanoma with proton therapy

2008 ◽  
Vol 53 (6) ◽  
pp. 1581-1594 ◽  
Author(s):  
Nicholas Koch ◽  
Wayne D Newhauser ◽  
Uwe Titt ◽  
Dan Gombos ◽  
Kevin Coombes ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Uveal Melanoma ◽  
Proton Therapy ◽  
Absorbed Dose ◽  
Monitor Unit ◽  
Monte Carlo Calculations

scholarly journals Dosymmetric estimates of 99mTc (MAA) and 133Xe in newborn lungs using Cristy-Eckerman / Segars representations

MOMENTO ◽  
2022 ◽  
pp. 54-65
Author(s):  
Marcial Vasquez-Arteaga ◽  
Héctor Vega-Carrillo ◽  
Gustavo Montalvo-Soberon ◽  
Juan Rivera-Vásquez ◽  
Pedro Jaramillo-Arica ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Total Dose ◽  
Residence Time ◽  
Absorbed Dose ◽  
Relative Difference ◽  
Monte Carlo Calculations ◽  
Absorbed Doses ◽  
Perfusion Agents

Using the Cristy-Eckerman (C-E) / Segars anatomical representations and the MIRD formalism, the Absorbed doses in lungs of newborn patients scanned with radiopharmaceuticals 133Xe (ventilation) and 99mTc (MAA) (perfusion) are estimated. These representations are phantoms used in Monte Carlo calculations to determine specific absorbed fractions, which, associated with the pharmaceutical residence time, determine the absorbed dose. Concerns about the dosimetric impact of using these ventilation / perfusion agents, as well as the use of different phantoms, were explored in newborn patients. When the lungs were scanned with 99mTc (MAA), the relative difference in total dose between the C-E / Segars anatomical representations was 1.0%. When the lungs were scanned with 133Xe, the relative difference in total dose between the anthropomorphic representations of C-E / Segars was 0.5%. Regardless of the radiopharmaceutical used for the pulmonary studies of a newborn patient, the substitution of the C-E representation for that of Segars does not reflect very significant changes in the calculation of the absorbed dose in the lungs, where the greatest dosimetric contribution is its self-dose, which is supplied mainly by the electrons produced during the 99mTc and 133Xe decay.

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