Encrypted login | home  Program Information  Using HVL and KVp
to Portray An X-Ray Source for Dose Calculations in CT
M Sommerville  M Sommerville1*, Y Poirier2, A Kouznetsov3, M
Tambasco4, (1) SAN DIEGO STATE UNIVERSITY, San Diego, CA, (2)
UNIVERSITY OF CALGARY, Calgary, AB, (3) UNIVERSITY OF CALGARY,
Calgary, AB, (4) SAN DIEGO STATE UNIVERSITY, San Diego, CA
MO-D-134-10 Monday 2:00PM - 3:50PM Room: 134  Purpose: To show
that the nominal peak tube voltage potential (kVp) and measured
half-value layer (HVL) are sufficient to generate energy spectra
and fluence profiles for fast and accurate machine-specific dose
computations in Computed Tomography (CT).  Methods:Spatial
variation of the x-ray source spectrum was found by measuring
HVL across the internal bowtie filter axis and using the nominal
kVp settings and third-party software Spektr to generate the
spectra. The beam fluence was calculated by multiplying in-air
dose measurements along the filter axis with the integral
product of the spectra and the in-