Abstract:
:Recent evidence indicates that isoeffect doses for spinal cord and kidney may be overestimated for fraction sizes as small as 1 or 2 Gy when calculated from a linear-quadratic (LQ) model fitted to data obtained for fraction sizes larger than 2 Gy. Reasons for this are unknown, but possible interpretations include exhaustion of repair capacity and incomplete repair in experiments designed to study the response to these small doses. The latter interpretation is motivated by the relatively short intervals between multiple daily doses given to the spinal cord (4 h) and kidney (5 h) when fraction sizes were small. The possibility that overestimation of isoeffect dose could be explained by incomplete repair during short intervals between doses was assessed by fitting experimental data to the incomplete-repair model. For the spinal cord the data could be interpreted by assuming that a repair process with a half-time of 1.7 h was incomplete; this half-time is negligibly different from the estimate obtained from repair-kinetics experiments with larger doses per fraction. The deviation from the (complete-repair) LQ model could be interpreted for the kidney in terms of a half-time of repair of 2.8 h (a negligibly different fit was obtained with the value 1.5 h). The clinical implication could be that multiple-fractions-per-day treatment would benefit from use of the longest feasible interfraction interval when late reactions are dose limiting.
journal_name
Int J Radiat Bioljournal_title
International journal of radiation biologyauthors
Thames HD,Ang KK,Stewart FA,van der Schueren Edoi
10.1080/09553008814551461subject
Has Abstractpub_date
1988-07-01 00:00:00pages
13-9issue
1eissn
0955-3002issn
1362-3095pii
MBAE13D6M7F714F0journal_volume
54pub_type
杂志文章abstract::This study simulates the exposure of V79 Chinese hamster fibroblasts to low-energy protons, deuterons and alpha-particles in the LET range 10-200 keV/microm. The starting assumption is that the induction of clustered lesions in DNA is a fundamental step for cell inactivation. A non-homogeneous cell population was simu...
journal_title:International journal of radiation biology
pub_type: 杂志文章
doi:10.1080/095530097143004
更新日期:1997-11-01 00:00:00
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journal_title:International journal of radiation biology
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更新日期:2017-02-01 00:00:00
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journal_title:International journal of radiation biology
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journal_title:International journal of radiation biology
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更新日期:2012-09-01 00:00:00
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journal_title:International journal of radiation biology
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更新日期:2008-05-01 00:00:00
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journal_title:International journal of radiation biology
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更新日期:1989-05-01 00:00:00
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journal_title:International journal of radiation biology
pub_type: 临床试验,杂志文章,随机对照试验
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更新日期:1999-04-01 00:00:00
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更新日期:2000-07-01 00:00:00
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doi:10.3109/09553002.2014.905724
更新日期:2014-07-01 00:00:00
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journal_title:International journal of radiation biology
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pub_type: 杂志文章,收录出版
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更新日期:2020-05-26 00:00:00
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更新日期:2013-07-01 00:00:00