Breast dose reduction with organ-based, wide-angle tube current modulated CT

Area of Science:

• Medical Physics
• Radiological Imaging
• Radiation Dosimetry

Background:

• Thoracic computed tomography (CT) involves radiation exposure, necessitating dose reduction strategies.
• Organ-dose-based tube current modulation (ODM) is an advanced technique for optimizing radiation dose during CT scans.
• Understanding the organ dose reduction potential of ODM is crucial for patient safety.

Purpose of the Study:

• To estimate the organ dose reduction potential of organ-dose-based tube current modulated (ODM) thoracic CT.
• To compare organ doses and dose conversion coefficients between standard tube current modulation (TCM) and ODM.
• To evaluate the impact of ODM on radiosensitive organs, including breast tissue composition variations.

Main Methods:

• Utilized 21 computational anthropomorphic phantoms (XCAT) simulating a diverse patient population.
• Simulated two breast tissue compositions: high and low glandular-to-adipose ratios.
• Employed the PENELOPE Monte Carlo program to estimate organ doses for TCM and ODM on a commercial CT scanner.

Main Results:

• ODM significantly reduced radiation doses to all radiosensitive organs compared to TCM.
• Breast dose was reduced by a substantial margin (specific percentage omitted for brevity).
• Anterior organs like the thyroid and stomach showed significant dose decreases with ODM, while posterior organs experienced minimal changes.

Conclusions:

• Organ-dose-based tube current modulated (ODM) thoracic CT demonstrates significant potential for reducing organ doses.
• ODM is particularly effective in lowering doses to radiosensitive superficial anterior organs, such as the breasts.
• This technique enhances patient safety by minimizing radiation exposure during thoracic CT examinations.