Abstract:
PURPOSE:In radiation biology, rats are often irradiated, but the precise dose distributions are often lacking, particularly in areas that receive scatter radiation. We used a non-dedicated set of resources to calculate detailed dose distributions, including doses to peripheral organs well outside of the primary field, in common rat exposure settings. MATERIALS AND METHODS:We conducted a detailed dose reconstruction in a rat through an analog to the conventional human treatment planning process. The process consisted of: (i) Characterizing source properties of an X-ray irradiator system, (ii) acquiring a computed tomography (CT) scan of a rat model, and (iii) using a Monte Carlo (MC) dose calculation engine to generate the dose distribution within the rat model. We considered cranial and liver irradiation scenarios where the rest of the body was protected by a lead shield. Organs of interest were the brain, liver and gonads. The study also included paired scenarios where the dose to adjacent, shielded rats was determined as a potential control for analysis of bystander effects. RESULTS:We established the precise doses and dose distributions delivered to the peripheral organs in single and paired rats. Mean doses to non-targeted organs in irradiated rats ranged from 0.03-0.1% of the reference platform dose. Mean doses to the adjacent rat peripheral organs were consistent to within 10% those of the directly irradiated rat. CONCLUSIONS:This work provided details of dose distributions in rat models under common irradiation conditions and established an effective scenario for delivering only scattered radiation consistent with that in a directly irradiated rat.
journal_name
Int J Radiat Bioljournal_title
International journal of radiation biologyauthors
Kirkby C,Ghasroddashti E,Kovalchuk A,Kolb B,Kovalchuk Odoi
10.3109/09553002.2013.791407subject
Has Abstractpub_date
2013-09-01 00:00:00pages
741-9issue
9eissn
0955-3002issn
1362-3095journal_volume
89pub_type
杂志文章abstract::The relationship between cellular radiosensitivity and normal-tissue response to radiotherapy in individual cancer patients has attracted increasing attention over the last few years. Recent work has suggested that a correlation exists between fibroblast sensitivity and normal-tissue reactions. We have examined the ra...
journal_title:International journal of radiation biology
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