Advertisement

Study on Different Method to Determine the Individual Diameter for Size-Specific Dose Estimates (SSDE) in Adult Patients

  • N. M. Huzail
  • M. A. A. M. Roslee
  • N. S. M. Azlan
  • N. D. Osman
Conference paper
Part of the Lecture Notes in Bioengineering book series (LNBE)

Abstract

The CT dose index (CTDI) and dose length product (DLP) are the most frequently used indicators to represent radiation doses in CT examination. However, the limitation of both is that they only estimate dose based on the scanner output information for specific standardized condition and phantom sizes. This study was aimed in evaluation of the radiation dose based on the SSDE method for adult abdomen CT study at AMDI, Universiti Sains Malaysia, Penang. A total of 91 CT procedures were selected consisting only adult patients undergo CT thorax-abdomen-pelvis (TAP) examination. As recommended by American Association of Physicist in Medicine (AAPM), the individual dimensions of each patient were determined. The conversion factors for SSDE were multiplied with the displayed CTDIvol. The comparative study between displayed CTDIvol with SSDE-calculated dose were done and percentage difference were then determined. From the results, significant differences were observed between SSDE-calculated and displayed dose with variations of 3–47% for method of AP and LAT summation, and 1.96–46% with method of effective diameter. The SSDE calculated doses were significantly higher than the displayed dose values by CT scanner. Therefore, evaluation of patient dose by individual specific size is critical for optimization of radiation exposure in CT imaging.

Keywords

Computed tomography Size-specific dose estimation (SSDE) Effective diameter CT dose index (CTDI) 

Notes

Acknowledgements

The authors would like to thank all radiographers and staff at Imaging Unit, AMDI USM, Malaysia for their help and support throughout this work.

References

  1. 1.
    Brady SL, Kaufman RA (2012) Investigation of american association of physicists in medicine report 204 size-specific dose estimates for paediatric CT implementation. Radiology 265(3):832–840Google Scholar
  2. 2.
    Brink JA, Morin RL (2012) Size-specific dose estimation for CT: how should it be used and what does it mean? Radiology 265(3):666–668CrossRefGoogle Scholar
  3. 3.
    Anam C, Haryanto F, Widita R, Arif I, Dougherty G (2016) A fully automated calculation of size-specific dose estimates (SSDE) in thoracic and head CT examinations. J Phys: Conf Ser 694(1):012–030Google Scholar
  4. 4.
    Boone JM, Strauss KJ, Cody DD, McCollough CH, McNitt-Gray MF, Toth TL (2013) Size-specific dose estimates (SSDE) in paediatric and adult body CT examinations: AAPM report no. 204 American Association of Physicists in Medicine website. 1–26Google Scholar
  5. 5.
    McCollough CH, Leng S, Yu L, Cody DD, Boone JM, McNitt-Gray MF (2011) CT dose index and patient dose: They are not the same thing. Radiology 259(2):311–316CrossRefGoogle Scholar
  6. 6.
    Christner JA, Braun NN, Jacobsen MC, Carter RE, Kofler JM, McCollough CH (2012) Size-specific dose estimates for adult patients at CT of the torso. Radiology 265(3):841–847CrossRefGoogle Scholar
  7. 7.
    Huda W, Vance A (2007) Patient radiation doses from adult and paediatric CT. Am J Roentgenol 188(2):540–546CrossRefGoogle Scholar
  8. 8.
    Brady SL, Mirro AE, Moore BM, Kaufman RA (2015) How to appropriately calculate effective dose for CT using either size-specific dose estimates or dose-length product. Am J Roentgenology 204(5):953–958CrossRefGoogle Scholar
  9. 9.
    Noferini L, Fulcheri C, Taddeucci A, Bartolini M, Gori C (2014) Considerations on the practical application of the size-specific dose estimation (SSDE) method of AAPM Report 204. Radiol Phys Technol 7(2):296–302CrossRefGoogle Scholar
  10. 10.
    Moore BM, Brady SL, Mirro AE, Kaufman RA (2014) Size-specific dose estimate (SSDE) provides a simple method to calculate organ dose for pediatric CT examinations Med Phys 41(7)Google Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • N. M. Huzail
    • 1
  • M. A. A. M. Roslee
    • 2
  • N. S. M. Azlan
    • 3
  • N. D. Osman
    • 4
  1. 1.School of PhysicsUniversiti Sains MalaysiaMinden, PenangMalaysia
  2. 2.Imaging UnitAdvanced Medical and Dental Institute, Universiti Sains MalaysiaKepala Batas, PenangMalaysia
  3. 3.Faculty of Computer and Mathematical SciencesUniversiti Teknologi MARAKota BharuMalaysia
  4. 4.Oncological & Radiological SciencesAdvanced Medical and Dental Institute, Universiti Sains MalaysiaKepala Batas, PenangMalaysia

Personalised recommendations