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Construction of a Preclinical Multimodality Phantom Using Tissue-mimicking Materials for Quality Assurance in Tumor Size Measurement

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Published on: July 29, 2013

Comparison of MDCT radiation dose: a phantom study.

William H Moore¹, Michael Bonvento, Rosemarie Olivieri-Fitt

¹Department of Radiology, Stony Brook University, University Hospital HSC Level 4, Room 120, Stony Brook, NY 11794, USA.

AJR. American Journal of Roentgenology

|October 24, 2006

Summary

Higher detector counts in multi-detector CT (MDCT) scanners significantly reduce radiation dose. This study found an inverse relationship between the number of detectors and radiation exposure, important for patient safety.

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X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging

X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging

Published on: September 11, 2011

Area of Science:

Radiology and Imaging
Medical Physics

Background:

Increasing use of CT imaging leads to higher population radiation exposure.
Limited comparative data exists on radiation doses from different MDCT systems.

Purpose of the Study:

To compare radiation exposure levels across various multi-detector CT (MDCT) systems.
To evaluate the impact of detector count on radiation dose in chest CT.

Main Methods:

Utilized an anthropomorphic phantom with thermoluminescent dosimeters placed in the chest.
Performed standard and near-identical chest CT scans on 4-, 8-, and 16-MDCT GE Healthcare systems.

Main Results:

The 4-detector array MDCT system showed significantly higher radiation dose than the 16-detector array (p < 0.01).
A trend of decreasing radiation dose with increasing detector numbers was observed.
An inverse relationship between measured radiation dose and detector count was established.

Conclusions:

Increasing the number of detectors in MDCT systems may reduce radiation dose.
This reduction is theorized to be due to decreased non-utilized radiation exposure.