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Comparison of MDCT Radiation Dose: A Phantom Study

William H. Moore1, Michael Bonvento1 and Rosemarie Olivieri-Fitt1

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


Figure 1
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  		Fig. 1 —Axial CT image of chest at section 18 of Rando phantom (The Phantom Laboratory). Packets of thermoluminescent dosimeters wrapped in cellophane (arrowheads) are placed at anterior, lateral, and center positions in this slice.

 

Figure 2
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  		Fig. 2 —Radiation dose for 4-, 8-, and 16-MDCT units using standard departmental protocol for CT of chest. Bars represent average radiation dose of five thermoluminescent dosimeters used at center, anterior, and lateral positions, respectively, in slice 18 (midportion of heart) of Rando phantom (The Phantom Laboratory). Error bars are 2 x SD.

 

Figure 3
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  		Fig. 3 —Trend of radiation dose with standard departmental protocol for 4-, 8-, and 16-MDCT units. Radiation dose is recorded in mGy. Error bars are 2 x SD. Each data point is average of five thermoluminescent dosimeters placed in center, anterior, and lateral aspects of Rando phantom (The Phantom Laboratory).

 

Figure 4
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  		Fig. 4 —Radiation dose for 4-, 8-, and 16-MDCT units using near-identical protocols. Bars represent average of five thermoluminescent dosimeters at each site with error bars representing 2 x SD.

 

Figure 5
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  		Fig. 5 —Trend of radiation dose with near-identical technique for 4-, 8-, and 16-MDCT units. Radiation dose is recorded in mGy; error bars are 2 x SD. Each data point is average of five thermoluminescent dosimeters placed in center, anterior, and lateral aspects of Rando phantom (The Phantom Laboratory).

 

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