© 2010 Standard Imaging, Inc. 1211-21, 2/10
•HEAD-SCATTER MEASUREMENT
Measure head-scatter factors
down to a 3 cm x 3 cm field size
simply and easily without
side scatter from a water tank
PHANTOMS
• account for stray radiation
Head-scatter,thestrayradiationinsidetheheadofa
linearaccelerator,occurswitheachmachine,someof
whichhitsthepatient.Thisradiationmustbetakeninto
accountwhendeterminingthetotalradiationdosegiven.
TheStandardImagingMiniPhantomallowsthe
measurementofhead-scatterfactorswithstandard
Farmer-typeionchambers.Thephantomstandis
smalltherebyminimizingscatter.Thestandcanalso
beusedasanin-aircomparisonjig,allowingtwoion
chamberstobepositionedside-by-sideinahighly
reproduciblemanner.
• MiniPhantom sPecifications
MiniPhantomDetectionSystem3,iscomprisedof:
• MiniPhantomforExradin®A12FarmerTypeIon
Chamber4,REF72208-C07,orExradinA19Classic
Farmer-typeChamber,REF72208-C10
• MiniPhantomStand/In-AirComparisonJig,REF72193
• versatile and easy to use
Thedetectionsystemiscomprisedofanionchamber
andthecolumnarMiniPhantom.TheMiniPhantomis
admaxcolumnarbuild-upcapwhichis3cmindiameter
and20cminlength.1,2ScribedlinesontheMiniPhantom
facilitatealignmentoftheionchamber’scollecting
volumeat10cmfromtheendofthephantom.The
standalsoallowstheMiniPhantomtobepositioned
horizontallyformeasuringbeams.
MiniPhantom and in-air comparison Jig
1P.A.JursinicandB.R.Thomadsen,“Measurementofhead-scatterfactorswithcylindricalbuild-upcapsandcolumnarminiphantoms,”Med. Phys.26(4),April1999.
2T.ZZhuandB.E.Bjarngard,“Headscatteroff-axisformegavoltagex-rays,”Med. Phys.30(4),April2003.
3Individualcomponentsmaybepurchasedseparately.
4MiniPhantomavailableforotherFarmer-typeionchambers.
3120 Deming Way Middleton WI 53562-1461 USA800-261-4446 . ph 608-831-0025 . fax 608-831-2202 www.standardimaging.com
