Journal of Medical Physics
ORIGINAL ARTICLE
Year
: 2007  |  Volume : 32  |  Issue : 1  |  Page : 29--33

Characterizing and configuring motorized wedge for a new generation telecobalt machine in a treatment planning system


Rajesh A Kinhikar, Smriti Sharma, Rituraj Upreti, Chandrashekhar M Tambe, Deepak D Deshpande 
 Department of Medical Physics, Tata Memorial Hospital, Parel, Mumbai - 400012, India

Correspondence Address:
Rajesh A Kinhikar
Dept. of Medical Physics, Tata Memorial Hospital, Dr. Ernest Borges Marg, Parel, Mumbai - 400 012
India

A new generation telecobalt unit, Theratron Equinox-80, (MDS Nordion, Canada) has been evaluated. It is equipped with a single 60-degree motorized wedge (MW), four universal wedges (UW) for 150, 300, 450 and 600. MW was configured in Eclipse (Varian, Palo Alto, USA) 3D treatment planning system (TPS). The profiles and central axis depth doses (CADD) were measured with radiation field analyzer blue water phantom for MW. These profiles and CADD for MW were compared with UW in a homogeneous phantom generated in Eclipse for various field sizes. The absolute dose was measured for a field size of 10 x 10 cm2 only in a MEDTEC water phantom at 10 cm depth with a 0.13 cc thimble ion chamber (Scanditronix Wellhofer, Uppsala, Sweden) and a NE electrometer (Nuclear Enterprises, UK). Measured dose with ion chamber was compared with the TPS predicted dose. MW angle was verified on the Equinox for four angles (15o, 30o, 45o and 60o). The variation in measured and calculated dose at 10 cm depth was within 2%. The measured and the calculated wedge angles were in well agreement within 2o. The motorized wedges were successfully configured in Eclipse for four wedge angles.


How to cite this article:
Kinhikar RA, Sharma S, Upreti R, Tambe CM, Deshpande DD. Characterizing and configuring motorized wedge for a new generation telecobalt machine in a treatment planning system.J Med Phys 2007;32:29-33


How to cite this URL:
Kinhikar RA, Sharma S, Upreti R, Tambe CM, Deshpande DD. Characterizing and configuring motorized wedge for a new generation telecobalt machine in a treatment planning system. J Med Phys [serial online] 2007 [cited 2020 Feb 25 ];32:29-33
Available from: http://www.jmp.org.in/article.asp?issn=0971-6203;year=2007;volume=32;issue=1;spage=29;epage=33;aulast=Kinhikar;type=0