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Radiation Dose for Multiregion CT Protocols: Challenges and Limitations.

Ramandeep Singh1,2, Timothy P Szczykutowicz3, Fatemeh Homayounieh1,2

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Classifying CT radiation doses is possible using scan length. Shorter scan lengths for chest CT compared to abdomen-pelvis CT allow accurate dose categorization in multiregion scans.

Keywords:
chest-abdomen-pelvis CTradiation dosesingle body partsingle runsplit run

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Area of Science:

  • Radiology
  • Medical Imaging
  • Radiation Dosimetry

Background:

  • Accurate classification of CT radiation doses is crucial for patient safety and effective radiation management.
  • Multiregion CT scans, combining chest and abdomen-pelvis imaging, present challenges in dose assessment.
  • Standardized methods for dose classification in multiregion CT are needed.

Purpose of the Study:

  • To develop a method for classifying individual chest and abdomen-pelvis CT doses in multiregion CT examinations.
  • To evaluate the feasibility of using scan length as a parameter for dose classification.
  • To analyze CT dose-length product (DLP) and volume CT dose index (CTDIvol) in relation to scan length.

Main Methods:

  • Retrospective analysis of 510 CT examinations (chest, abdomen-pelvis, and combined chest-abdomen-pelvis) from four MDCT scanners.
  • Recorded CTDIvol, DLP, and scan length for all examinations.
  • Analyzed data using ANOVA and ROC analysis, comparing with an additional 7745 examinations.

Main Results:

  • Significant differences were observed in DLPs and scan lengths between chest, abdomen-pelvis, and single-run chest-abdomen-pelvis CT (p < 0.0001).
  • For split-run chest-abdomen-pelvis CT, scan lengths and dose indexes for individual regions did not differ from single-region scans (p > 0.05).
  • ROC analysis identified an ideal scan length threshold of 38 cm to differentiate chest from abdomen-pelvis CT with 97.39% accuracy and an AUC of 0.9764.

Conclusions:

  • Scan length is a reliable parameter for differentiating chest and abdomen-pelvis CT scans.
  • Accurate dose classification for split-run combined chest-abdomen-pelvis CT is achievable by leveraging differences in scan lengths.
  • This method aids in managing radiation doses effectively despite interscanner variability.