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Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies

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CTPA protocol optimisation audit: challenges of dose reduction with maintained image quality.

A Nania¹, A Weir², N Weir²

¹Department of Medical Physics, Royal Infirmary of Edinburgh, 51 Little France Crescent, Edinburgh EH16 4SA, UK.

Clinical Radiology

|November 8, 2017

Summary

This summary is machine-generated.

Optimizing computed tomography pulmonary angiography (CTPA) protocols significantly reduced radiation dose, ensuring compliance with dose reference levels without compromising diagnostic image quality. This advancement benefits patient safety in medical imaging.

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Area of Science:

Radiology
Medical Imaging
Radiation Dose Optimization

Background:

Computed tomography pulmonary angiography (CTPA) is crucial for diagnosing pulmonary embolism.
Elevated radiation doses in CTPA can pose risks to patients.
Standardized protocols are needed to balance diagnostic efficacy and radiation safety.

Purpose of the Study:

To assess and optimize CTPA radiation dose and image quality in a teaching hospital.
To reduce patient radiation exposure while maintaining diagnostic image quality.

Main Methods:

Collected dose-length product (DLP), patient size, and objective image quality metrics (CNR, SNR) from 31 CTPA patients.
Subjective image quality was evaluated by three cardiothoracic radiologists.
Experimental phantom studies informed protocol modifications.
Modified CTPA scanner settings (noise level, minimum amperage) and audited a new patient cohort.

Main Results:

Initial average DLP (559 mGy·cm) exceeded local and national dose reference levels (DRLs).
The optimized protocol reduced average DLP to 359 mGy·cm.
Image quality, assessed objectively and subjectively, was preserved after protocol changes.

Conclusions:

The revised CTPA protocol achieved significant radiation dose reduction.
The new protocol is compliant with national and local DRLs.
Diagnostic image quality was maintained, enhancing patient safety.