Document Detail


The importance of radiometer angular response for ultraviolet phototherapy dosimetry.
MedLine Citation:
PMID:  10232800     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The influence of the angular response of radiometer probes on measurements of irradiance in ultraviolet phototherapy has been studied. Irradiance measurements were made using nine ultraviolet (UV) radiometers employed by phototherapy centres in Scotland and Northern Ireland, and compared with measurements made using two spectroradiometers. The light sources used were UVB TL01 fluorescent lamps, arranged in different geometries. Irradiances within TL01 whole body treatment cabinets were assessed based on a comparison with one of the spectroradiometers. The results show variations of 50% in cabinet irradiance measurements made by different radiometers, even when they were calibrated using the same source geometry and spectroradiometer. Differences in radiometer probe design and construction lead to an under- or over-response at angles of incidence greater than zero. Angular responses of different probes were assessed using banks of fluorescent lamps. The differences found are large enough to account for the variations in measurements of cabinet irradiance. The variations in irradiance measurements are significant in terms of planning and monitoring patient exposure during TL01 phototherapy. Accurate dosimetry can only be achieved if radiometer probes have a good cosine response and recommendations are made for better calibration techniques.
Authors:
C J Martin; G D Currie; S D Pye
Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Physics in medicine and biology     Volume:  44     ISSN:  0031-9155     ISO Abbreviation:  Phys Med Biol     Publication Date:  1999 Apr 
Date Detail:
Created Date:  1999-07-28     Completed Date:  1999-07-28     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0401220     Medline TA:  Phys Med Biol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  843-55     Citation Subset:  IM    
Affiliation:
Department of Clinical Physics and Bio-Engineering, West Glasgow Hospitals University NHS Trust, UK.
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MeSH Terms
Descriptor/Qualifier:
Radiometry / instrumentation*,  methods*
Radiotherapy Planning, Computer-Assisted / instrumentation*,  methods*
Ultraviolet Therapy / methods*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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