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Estimation of Radiation Dose in CT Chest and Abdomen Examinations Using Size-Specific Dose Estimates

DOI: 10.4236/oalib.1109843, PP. 1-18

Subject Areas: Radiology & Medical Imaging

Keywords: Computed Tomography, SSDE, CTDI, Patient Dose in CT

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Objective: This is a retrospective and cross-sectional-analytical design study aimed to estimate the radiation exposure dose for adult patients undergoing chest and abdomen CT examinations at Khartoum state hospitals. Material and Methods: Using Size-Specific Dose Estimates (SSDEs) to investigate the effect of body dimensions (Deff) on SSDE calculated from transverse or scout CT images. Scan parameters were collected for 330 adult patients with 165 chests and 165 abdomens for 161 females and 169 males at four hospitals in Khartoum state. For SSDE calculations, it depends on the conversion factor, conversion factors are based on 4 different measurements of torso or head thickness (in our case it’s torso) to represent patient size: by using digital calipers on the scanner console the anteroposterior dimension (AP), the lateral dimension (LAT), the sum of the dimensions (AP LAT), and the effective diameter (Deff) (square root of the product of AP and LAT), which measured from the mid-slice location from transverse or scout CT images. The (Deff) was converted into conversion factors (f) as mentioned in AAPM report 204. Then, the SSDE was calculated by multiplying the console displayed CTDIvol with the size-specific conversion factors (f), in which SSDE is given in mGy. Results: The study found in chest CT, mean CTDIvol and SSDE were 11.99 ± 6.94 mGy and 16.89 ± 9.82 mGy, respectively. In abdominal CT, mean CTDIvol and SSDE were 12.77 ± 8.72 mGy and 18.01 ± 12.30 mGy, respectively. Conclusion: Adding SSDE metric to CT systems and patient dose report is important to help reduce radiation dose to patients according to their dimensions.

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Amer, A. , Ahmed, W. , Hussein, A. , Mehta, A. , Khalif, A. and Abdullah, M. (2023). Estimation of Radiation Dose in CT Chest and Abdomen Examinations Using Size-Specific Dose Estimates. Open Access Library Journal, 10, e9843. doi:


[1]  International Atomic Energy Agency (IAEA) (2011) Status of Computed Tomography Dosimetry for Wide Cone Beam Scanners. IAEA Human Health Reports, No. 5, IAEA, Vienna.
[2]  Lee, W.G. (2007) Principles of CT: Radiation Dose and Image Quality. Journal of Nuclear Medicine Technology, 35, 213-225.
[3]  Castellano, I. and Geleijns, J. (2007) Computed Tomography. In: Lemoigne, Y., Caner, A. and Rahal, G., Eds., Physics for Medical Imaging Applications, NATO Science Series, Vol. 240, Springer, Dordrecht, 367-379.
[4]  Seeram, E. (2015) Computed Tomography-E-Book: Physical Principles, Clinical Applications, and Quality Control. Elsevier Health Sciences, Amsterdam.
[5]  Confidence, Maintaining Diagnostic (2009) Dose Reduction in CT While Maintaining Diagnostic Confidence: A Feasibility/Demonstration Study. IAEA.
[6]  Bauhs, J.A., et al. (2008) CT Dosimetry: Comparison of Measurement Techniques and Devices. RadioGraphics, 28, 245-253.
[7]  Brenner, D.J., and Hall, E.J. (2007) Computed Tomography—An Increasing Source of Radiation Exposure. The New England Journal of Medicine, 357, 2277-2284.
[8]  American College of Radiology (2008) ACR Practice Guideline for Diagnostic Reference Levels in Medical X-Ray Imaging. Practice Guidelines and Technical Standards, 799-804.
[9]  McCollough, C.H., Leng, S., Yu, L., Cody, D.D., Boone, J.M. and McNitt-Gray, M.F. (2011) CT Dose Index and Patient Dose: They Are Not the Same Thing. Radiology, 259, 311-316.
[10]  Brink, J.A., and Morin,R.L. (2012) Size-Specific Dose Estimation for CT: How Should It Be Used and What Does It Mean? Radiology, 265, 666-668.
[11]  Boone, J.M. (2012) Reply to “Comment on the ‘Report of AAPM TG 204: Size-Specific Dose Estimates (SSDE) in Pediatric and Adult Body CT Examinations’”. Medical Physics, 39, 4615-4616.
[12]  Wang, J., Christner, J.A., Duan, X., Leng, S., Yu, L. and McCollough, C.H. (2012) Attenuation‐Based Estimation of Patient Size for the Purpose of Size Specific Dose Estimation in CT. Part II. Implementation on Abdomen and Thorax Phantoms Using Cross Sectional CT Images and Scanned Projection Radiograph Images. Medical Physics, 39, 6772-6778.
[13]  Bostani, M., McMillan, K., Lu, P., Kim, H.J., Cagnon, C.H., DeMarco, J.J. and McNitt-Gray, M.F. (2015) Attenuation-Based Size Metric for Estimating Organ Dose to Patients Undergoing Tube Current Modulated CT Exams. Medical Physics, 42, 958-968.
[14]  Bashier, E.H., Suliman I.I. (2018) Multi-Slice CT Examinations of Adult Patients at Sudanese Hospitals: Radiation Exposure Based on Size-Specific Dose Estimates (SSDE). La Radiologia Medica, 123, 424-431.
[15]  Christner, J.A., Braun, N.N., Jacobsen, M.C., Carter, R.E., Kofler, J.M. and McCollough, C.H. (2012) Size-Specific Dose Estimates for Adult Patients at CT of the Torso. Radiology, 265, 841-847.
[16]  American College of Radiology. ACR–AAPM Practice Parameter for Diagnostic Reference Levels and Achievable Doses in Medical X-Ray Imaging. ACR, Reston, VA, 201 p.


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