Cancerogenesis Risks between 64 and 320 Row Detector CT for Coronary CTA Screening

Area of Science:

• Radiological physics and medical imaging.
• Oncology and cancer risk assessment.
• Cardiovascular disease screening.

Background:

• Coronary computed tomography angiography (CCTA) is crucial for diagnosing coronary artery disease.
• Different CT scanner technologies, such as 64-row and 320-row detectors, vary in radiation dose and potential cancer risks.
• Decennial screening guidelines aim to detect sudden cardiac death risk in asymptomatic individuals.

Purpose of the Study:

• To compare the cancerogenesis risks associated with 64-row and 320-row detector CT scanners for CCTA.
• To evaluate the lifetime attributable risks (LAR) of cancer following decennial screening in patients aged 50-70.

Main Methods:

• Compared radiation-absorbed data for lung, thyroid, and female breast from published literature (64-row CT) with study data (320-row CT).
• Calculated lifetime attributable risks (LAR) of cancer using the BEIR VII report for both scanner types.
• Analyzed data for patients aged 50-70 undergoing CCTA.

Main Results:

• The 320-row CT scanner demonstrated a 30% reduction in lung cancer LAR and over 50% reduction in female breast cancer LAR compared to the 64-row scanner.
• Cancer incidence with 320-row CT is <1/500 for breast cancer in women and <1/1000 for lung cancer in men, significantly lower than other risk factors.
• Decennial screening benefits over 355,000 patients annually, primarily those with significant coronary artery disease; thyroid cancer LAR was negligible for both scanners.

Conclusions:

• Substantial reductions in lung and female breast cancer LAR are achieved with the 320-row detector CT compared to the 64-row detector CT.
• The benefits of decennial CCTA screening using the 320-row detector CT outweigh the increased cancer risks for individuals aged 50-70.
• The 320-row CT scanner offers a safer alternative for CCTA screening, minimizing radiation-induced cancer risks.