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[Single-slice and multi-slice computerized tomography: dosimetric comparison with diagnostic reference dose levels].

L Moro1, A Bolsi, M Baldi

  • 1Servizio di Fisica Sanitaria IRCCS, Istituto Scientifico, Pavia, Italy. lmoro@fsm.it

La Radiologia Medica
|December 12, 2001
PubMed
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Newer multi-slice CT scanners deliver higher radiation doses than single-slice systems, necessitating protocol optimization for patient safety. Dose-length product (DLP) values were higher, but generally within diagnostic reference levels (DRLs).

Area of Science:

  • Medical Imaging Physics
  • Radiological Protection
  • Diagnostic Radiology

Background:

  • Computed Tomography (CT) dose assessment is crucial for patient safety.
  • Advancements in CT technology, such as multi-slice scanners, require re-evaluation of radiation dose parameters.
  • Diagnostic Reference Levels (DRLs) provide benchmarks for acceptable radiation doses in medical imaging.

Purpose of the Study:

  • To compare the absorbed radiation dose between single-slice and multi-slice CT systems for head, thorax, abdomen, and pelvis examinations.
  • To evaluate CT dose index (nCTDIW) and dose-length product (DLP) values against established Diagnostic Reference Levels (DRLs).
  • To assess the accuracy of the multi-slice system's automatic dose evaluation.

Main Methods:

  • Comparison of a multi-slice GE LightSpeed QX/i ADVANTAGE with a single-slice GE ProSpeed SX.

Related Experiment Videos

  • Measurement of radiation beam profiles using a phosphor plate.
  • Dose measurements utilizing a CT pencil ionization chamber and PMMA phantoms, adhering to EUR 16262 EN Guidelines.

    • Main Results:

    • Multi-slice CT systems exhibited systematically higher normalized and weighted computed tomographic dose index (nCTDIW) values (up to 36%) and dose-length product (DLP) compared to single-slice systems.
    • Most measured values remained below DRLs, with the exception of the head multi-slice protocol, indicating a need for parameter adjustment.
    • The multi-slice system's automatic dose evaluation consistently underestimated DLP values, necessitating calibration.

    Conclusions:

    • Multi-slice CT scanners deliver higher radiation doses due to wider beam profiles, shorter focal spot-to-isocenter distance, and longer effective scan lengths.
    • Despite higher doses, advancements like rapid scan times (<1s) and reduced current values in multi-slice technology can enhance patient protection.
    • Optimization of acquisition parameters, particularly for head examinations, is essential to minimize patient dose while maintaining diagnostic image quality.