  CD16 is a MATLAB-based dosimetry system designed for rapid estimation of
organ doses for x-ray guided cardiac catheterization procedures. CD16 is
principally designed for epidemiological studies in which dose estimates are
required for thousands of cohort members, often based on limited exposure
information. The minimum data required for dose estimates are (1) total
examination kerma area product (PKA), (2) patient size (age or mass), (3) x-ray
spectrum represented by half value layer (HVL, in mm Al) and (4) examination
type. These data can be inputted using an Excel spreadsheet. Organ dose
estimates are outputted into the same spreadsheet. Doses are estimated using
lookup tables of k-factors relating PKA to organ doses for a wide range of beam
angles, six patient sizes and two field sizes. These K-factors were calculated
using the Monte Carlo code PCXMC V2.0. CD16 initially calculates organ doses
for a beam energy represented by a HVL of 4.8 mm Al, then adjusts to other beam
energies if specified. Beam angles can be specified if known, otherwise CD16
assigns beam angles based on examination type. CD16 is the final version of
this dosimetry system to utilise PCXMC. Future versions will use the general
purpose Monte Carlo code MCNP and hybrid phantoms.
