International Journal of Radiation Research
نشریه پرتو پژوه
Int J Radiat Res
Basic Sciences
http://ijrr.com
79
journal79
2322-3243
2345-4229
10.61186/ijrr
en
jalali
1383
6
1
gregorian
2004
9
1
2
2
online
1
fulltext
en
Measurement of stereotactic beam data of 9 MV X-rays using diode detector
Radiation Biology
Radiation Biology
تحقيق بديع
Original Research
<p><strong>Background: </strong>Radiosurgery is a focal brain irradiation technique that delivers, usually in a single session, high dose of ionizing radiation. The presence of lateral electronic disequilibrium and steep dose gradients in small fields demands special attention to the selection of a suitable detector with respect to its size, composition and response. </p><p><strong>Materials and Methods </strong><strong>: </strong>Small circular fields were produced by home-made collimators attached to a 9MV Neptun 10 PC linac ranging from 12.5mm to 25 mm at isocenter level in 2.5 mm <br>increment. Stereotactic beam data including percent depth dose, off axis ratio and output factor were measured using p-type silicon chip detector in a water phantom. Beam data were plotted for all available collimator sizes. </p><p><strong>Results: </strong>Percent depth dose values at depth of 100 cm show 10 percent increase with enlargement of the field sizes from 12.5 mm to 25mm. Small overestimation of output factor has been observed using diode detector. </p><p><strong>Conclusion: </strong>It is concluded for stereotactic radiosurgery with higher energy photon diode <br>detector could be a good and reasonable choice to measure percent depth dose and off axis ratio. Regarding the output factor, it is better to compare the results with those obtained by other <br>detectors. <i>Iran </i><i>. J. Radiat. Res., 2004 2 (2): 79-84 </i></p>
,Stereotactic radiosurgery,diode detector,beam data,auxiliary collimator
79
84
http://ijrr.com/browse.php?a_code=A-10-1-62&slc_lang=en&sid=1
M.T. Bahreyni Toossi
m-t-bahreyni@mums.ac.ir
79003194753284600150
79003194753284600150
Yes
A.R. Khoshbin Khoshnazar
79003194753284600151
79003194753284600151
No