WFRF:(Knöös Tommy)
Sökning: WFRF:(Knöös Tommy) > (2010-2014) > Photon beam quality...
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| Fältnamn | Indikatorer | Metadata |
|---|---|---|
| 000 | 03565naa a2200385 4500 | |
| 001 | oai:lup.lub.lu.se:bec2e456-ac8f-4512-970e-06079d049cad | |
| 003 | SwePub | |
| 008 | 160401s2010 | |||||||||||000 ||eng| | |
| 024 | 7 | a https://lup.lub.lu.se/record/15336322 URI |
| 024 | 7 | a https://doi.org/10.1118/1.32646172 DOI |
| 040 | a (SwePub)lu | |
| 041 | a engb eng | |
| 042 | 9 SwePub | |
| 072 | 7 | a art2 swepub-publicationtype |
| 072 | 7 | a ref2 swepub-contenttype |
| 100 | 1 | a Georg, Dietmar4 aut |
| 245 | 1 0 | a Photon beam quality variations of a flattening filter free linear accelerator |
| 264 | c 2009-12-04 | |
| 264 | 1 | b Wiley,c 2010 |
| 520 | a Purpose: Recently, there has been an increasing interest in operating conventional linear accelerators without a flattening filter. The aim of this study was to determine beam quality variations as a function of off-axis ray angle for unflattened beams. In addition, a comparison was made with the off-axis energy variation in flattened beams. Methods: Two Elekta Precise linear accelerators were modified in order to enable radiation delivery with and without the flattening filter in the beam line. At the Medical University Vienna (Vienna, Austria), half value layer (HVL) measurements were performed for 6 and 10 MV with an in-house developed device that can be easily mounted on the gantry. At St. Luke's Hospital (Dublin, Ireland), measurements were performed at 6 MV in narrow beam geometry with the gantry tilted around 270 degrees with pinhole collimators, an attenuator, and the chamber positioned on the table. All attenuation measurements were performed with ionization chambers and a buildup cap (2 mm brass) or a PMMA mini phantom (diameter 3 cm, measurement depth 2.5 cm). Results: For flattened 6 and 10 MV photon beams from the Elekta linac the relative HVL(theta) varies by about 11% for an off-axis ray angle theta=10 degrees. These results agree within +/-2% with a previously proposed generic off-axis energy correction. For unflattened beams, the variation was less than 5% in the whole range of off-axis ray angles up to 10 degrees. The difference in relative HVL data was less than 1% for unflattened beams at 6 and 10 MV. Conclusions: Off-axis energy variation is rather small in unflattened beams and less than half the one for flattened beams. Thus, ignoring the effect of off-axis energy variation for dose calculations in unflattened beams can be clinically justified. (C) 2010 American Association of Physicists in Medicine. [DOI: 10.1118/1.3264617] | |
| 650 | 7 | a NATURVETENSKAPx Biologix Biofysik0 (SwePub)106032 hsv//swe |
| 650 | 7 | a NATURAL SCIENCESx Biological Sciencesx Biophysics0 (SwePub)106032 hsv//eng |
| 653 | a half value layer | |
| 653 | a unflattened beams | |
| 653 | a off-axis energy variation | |
| 700 | 1 | a Kragl, Gabriele4 aut |
| 700 | 1 | a Af Wetterstedt, Sacha4 aut |
| 700 | 1 | a McCavana, Patrick4 aut |
| 700 | 1 | a McClean, Brendan4 aut |
| 700 | 1 | a Knöös, Tommyu Lund University,Lunds universitet,Medicinsk strålningsfysik, Lund,Sektion V,Institutionen för kliniska vetenskaper, Lund,Medicinska fakulteten,Medical Radiation Physics, Lund,Section V,Department of Clinical Sciences, Lund,Faculty of Medicine4 aut0 (Swepub:lu)rafy-tom |
| 710 | 2 | a Medicinsk strålningsfysik, Lundb Sektion V4 org |
| 773 | 0 | t Medical Physicsd : Wileyg 37:1, s. 49-53q 37:1<49-53x 0094-2405 |
| 856 | 4 | u http://dx.doi.org/10.1118/1.3264617y FULLTEXT |
| 856 | 4 8 | u https://lup.lub.lu.se/record/1533632 |
| 856 | 4 8 | u https://doi.org/10.1118/1.3264617 |
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