Reduced Z-axis coverage multidetector CT angiography for suspected acute pulmonary embolism could decrease dose and...

Area of Science:

• Radiology
• Medical Imaging
• Cardiovascular Imaging

Background:

• Multidetector computed tomographic angiography (MDCTA) is the gold standard for diagnosing acute pulmonary embolism (PE).
• Increasing use of MDCTA has led to higher radiation exposure for patients.
• Current dose reduction techniques may compromise image quality and diagnostic accuracy.

Purpose of the Study:

• To evaluate the impact of reduced Z-axis coverage on the diagnostic accuracy of MDCTA for acute PE.
• To determine if limiting scan range from the aortic arch to the heart affects PE detection.

Main Methods:

• Retrospective analysis of 295 MDCTA examinations for suspected acute PE performed on a 64-detector-row MDCT.
• Z-axis coverage was retrospectively reduced by 37% to the range from the top of the aortic arch through the heart.
• All reduced datasets were reinterpreted for the presence of PE.

Main Results:

• No cases initially interpreted as positive for PE became negative after reducing Z-axis coverage.
• Reduced Z-axis coverage (37% reduction) did not alter the diagnostic outcome for PE detection.
• This suggests that image quality and diagnostic accuracy were preserved.

Conclusions:

• Reduced Z-axis coverage in MDCTA for acute PE is a viable strategy for lowering radiation dose.
• This approach can decrease radiation exposure without compromising diagnostic accuracy.
• Further research is warranted to optimize radiation dose reduction while maintaining diagnostic performance.