Investigation of the dosimetry of chest tomosynthesis

• Chest tomosynthesis has recently been introduced to healthcare as a low-dose alternative to CT or as a tool for improved diagnostics in chest radiography with only a modest increase in radiation dose to the patient. However, no detailed description of the dosimetry for this type of examination has been presented. The aim of this work was therefore to investigate the dosimetry of chest tomosynthesis. The chest tomosynthesis examination was assumed to be performed using a stationary detector and a vertically moving x-ray tube, exposing the patient from different angles. The Monte Carlo-based computer software PCXMC was used to determine the effective dose delivered to a standard-sized patient from various angles using different assumptions of the distribution of the effective dose over the different projections. The obtained relationships between input dose measures and effective dose for chest tomosynthesis for different angular intervals were then compared with the osteroanterior (PA) projection. The results indicate that the error is small when using the assumption that all effective dose in the case of chest tomosynthesis is delivered in PA projection for estimating the total effective dose for chest tomosynthesis for normally sized patients. This is especially true if the relationship between the kerma-area product (KAP) and effective dose is used. © 2009 SPIE.

Ämnesord

MEDICIN OCH HÄLSOVETENSKAP  -- Klinisk medicin -- Radiologi och bildbehandling (hsv//swe)

MEDICAL AND HEALTH SCIENCES  -- Clinical Medicine -- Radiology, Nuclear Medicine and Medical Imaging (hsv//eng)

Nyckelord

Chest tomosynthesis

Patient dosimetry

Publikations- och innehållstyp

vet (ämneskategori)

art (ämneskategori)