Comparison of radiation dose in Multidetector computed tomography and Flat-panel computed tomography for imaging of the wrist

This poster is published under an open license. Please read the disclaimer for further details.

Congress:

ECR 2015

Poster Number:

C-1457

Type:

Scientific Exhibit

Keywords:

Radioprotection / Radiation dose, CT, Cone beam CT, Comparative studies, Dosimetric comparison

Authors:

J. Neubauer¹, C. Neubauer¹, M. Langer¹, E. Kotter¹, J. M. Voigt², M. Fiebich²; ¹Freiburg/DE, ²Gießen/DE

DOI:

10.1594/ecr2015/C-1457

DOI-Link:

https://dx.doi.org/10.1594/ecr2015/C-1457

Fig. 1: Scatterplot: Sum of all ratings for MDCT vs. Dose. The color of the points...

Fig. 2: Scatterplot: Sum of all ratings for FPCT vs. Dose. The color of the points...

Aims and objectives

The aim of our study was to find the lowest radiation dose still resulting in good image quality for a multidetector computed tomography (MDCT) and a flat-panel computed tomography (FPCT) in wrist examinations.

Methods and materials

We used a 320-row MDCT (Aquilion One, Toshiba, Otawara-shi, Japan) and a mobile dedicated extremity FPCT (Verity; Planmed, Helsinki, Finland) for data acquisition. For the MDCT the voltage can be set to 80, 100, 120 and 135 kVp. In FPCT the voltage can be changed from 80 to 96 kVp. The default settings for wrist examinations were 120 kVp / 40 mAs in the MDCT and 90 kVp / 36 mAs in the FPCT. In vitro wrist examinations of a cadaveric human hand were performed...

Results

The calculated mean dose in the wrist ranged from 1.14 mGy in the lowest dose setting to 34.36 mGy in default dose setting in MDCT examinations and from 1.76 mGy in lowest dose setting to 7.15 mGy in default dose setting in FPCT examinations. The lowest dose resulting in good image quality for all structures was 4.54±0.10 mGy for MDCT using a voltage of 100 kVp and a current of 20 mAs (Fig. 1), for FPCT it was 5.72±0.13 mGy with 90 kVp and 30...

Conclusion

We found both MDCT and FPCT to produce good image quality in wrist imaging with lower dose settings than the default settings. Although FPCT needed less radiation dose in default settings, we found the lowest dose setting with a good overall image quality to be achieved by the MDCT. Thus, adjusting CT protocols for wrist imaging seems advisable for both modalities with the MDCT having an even higher potential for dose reduction. In the last decade several studies suggested that small compact FPCTs would administer...

Personal information

References

1. Neubauer J, Voigt JM, Lang H, et al. (2014) Comparing the Image Quality of a Mobile Flat-Panel Computed Tomography and a Multidetector Computed Tomography: A Phantom Study. Investig Radiol 49:491–497. 2. Loubele M, Bogaerts R, Van Dijck E, et al. (2009) Comparison between effective radiation dose of CBCT and MSCT scanners for dentomaxillofacial applications. Eur J Radiol 71:461–468. 3. Silva MAG, Wolf U, Heinicke F, et al. (2008) Cone-beam computed tomography for routine orthodontic treatment planning: A radiation dose evaluation. Am J Orthod Dentofac...