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COMPARISON OF THE 64- AND 80-DETECTOR ROW COMPUTED TOMOGRAPHY AMONG THE CT NUMBER AND RADIATION DOSE DURING LOWER

Ryo Moriwake1, Takanori Masuda2, Akira Yamamoto3

  • 1Department of Radiological Technology, Kawasaki Medical School Hospital, 577, Matsushima, Kurashiki, Okayama 701-0192, Japan.

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A 64-detector row computed tomography (CT) scanner showed higher CT numbers and radiation dose than an 80-detector row scanner during lower extremity CT angiography (LE-CTA). Image quality did not improve with the wider detector.

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Area of Science:

  • Radiology
  • Medical Imaging

Background:

  • Lower extremity computed tomography angiography (LE-CTA) is crucial for diagnosing peripheral artery disease.
  • Optimizing CT scanner technology is essential for improving diagnostic accuracy and patient safety.

Purpose of the Study:

  • To compare computed tomography (CT) numbers and radiation dose between 64-detector row (Group A) and 80-detector row (Group B) scanners during LE-CTA.
  • To evaluate the impact of scanner technology on image quality and radiation exposure in LE-CTA.

Main Methods:

  • A comparative study involving 144 patients undergoing LE-CTA.
  • Analysis of CT numbers for popliteal arteries, radiation dose (dose-length product), and the rate of optimal CT numbers (>200 HU).

Main Results:

  • Group A (64-detector row) exhibited significantly higher CT numbers and mean dose-length product compared to Group B (80-detector row) (P < 0.01).
  • The rate of optimal CT numbers for popliteal arteries was higher in Group A (56.9%) than in Group B (23.6%) (P < 0.05).
  • Despite higher CT numbers and radiation dose, depiction ability did not improve with the wider detector scanner.

Conclusions:

  • The 64-detector row CT scanner resulted in higher CT numbers, increased radiation dose, and a higher rate of optimal CT numbers compared to the 80-detector row scanner during LE-CTA.
  • Wider detector CT scanners do not necessarily improve depiction ability during LE-CTA, suggesting that scanner technology alone may not enhance diagnostic performance.