objective: radiochromic ebt3 film is a later generation of radiochromic films. the aim of this study is to compare ebt and ebt3 radiochromic films in radiotherapy fields of breast cancer. methods: a rando phantom was irradiated by a 6 mv siemens primus linac with medial and lateral fields of radiotherapy of breast cancer. dosimetry was performed in various points in the fields using ebt and ebt...

This paper presents dose calculation in proton therapy using Monte Carlo method and comparison with experimental data obtained at TOHOKU University’s cyclotron and isotope center in Japan. In this way, two Monte Carlo codes, FLUKA and MCNPX, has been employed to calculate percentage depth dose, lateral dose profiles, isodose curves and secondary particles production for proton pencil and broad ...

Deformable 3D dosimeters have potential applications in validating deformable dose mapping algorithms. This study evaluates a novel deformable PRESAGE® dosimeter and its application toward validating the deformable algorithm employed by VelocityAI. The deformable PRESAGE® dosimeter exhibited a linear dose response with a sensitivity of 0.0032 ΔOD/(Gy/cm). Comparison of an experimental dosimeter...

Introduction: Total body irradiation (TBI) is a form of external beam radiotherapy which is used in conjunction with chemotherapy with the purpose of immunosuppression. Since the target in TBI is the whole body so a uniform dose distribution throughout the entire body during TBI is necessary. As recommended by AAPM dose variation must be within ±10% of prescription dose. A revi...

The advanced imaging and delivery techniques in proton therapy allow conformal high-dose irradiation of the target volume with high accuracy using pencil beam scanning or shaping apertures. These methods increasingly include small radiation fields large dose gradients, which require detector systems spatial resolution for quality assurance. In addition measurement all success parameters daily a...

Purpose: To model the ELEKTA COMPACT accelerator head by using EGSnrc/BEAMnrc/DOSXYZnrc and to validatethe simulation according depth-dose lateral profiles of different radiation fields measured water phantom. Methods: IBA Blue Water Phantom2 CC13 Ionization Chamber were used measure curves at 10 cm × field profile depth underwater. In BEAMnrc, main components initial electron beam are establis...

With the number of new proton centers increasing rapidly, there is a need for an assessment of the available proton treatment planning systems (TPSs). This study compares the dose distributions of complex meningioma plans produced by three proton TPSs: Eclipse, Pinnacle3, and XiO. All three systems were commissioned with the same beam data and, as best as possible, matched configuration setting...

Aging is associated with a progressive decrease in appetite and food intake. Both A and B orexins, expressed in specific neurons of the lateral hypothalamic area, have been implicated in the regulation of sleep and feeding. In this study, the stimulatory effect of intracerebroventricular administration of the orexins on food intake was compared between young (4-mo-old) and old (25- to 27-mo-old...

Scanned ion beam delivery enables the highest degree of target dose conformation attainable in external beam radiotherapy. Nominal pencil beam widths (spot sizes) are recorded during treatment planning system commissioning. Due to changes in the beam-line optics, the actual spot sizes may differ from these commissioning values, leading to differences between planned and delivered dose. The purp...

background: to suggest south india ct diagnostic reference levels (drls) by collecting radiation doses for the most commonly performed ct examinations. materials and methods: a pilot study investigated the most frequent ct examinations. 110 ct sites were asked to complete a survey booklet to allow the recording of ct parameters for each of 3 ct examinations during a 1 year time period. dose dat...