Evaluation of image quality and task performance for a mobile C-arm with a complementary metal-oxide semiconductor...

Area of Science:

• Medical Imaging
• Radiology
• Biomedical Engineering

Background:

• Flat-panel detectors are crucial in medical imaging for interventional radiology.
• Complementary metal-oxide semiconductor (CMOS) and hydrogenated amorphous silicon (a-Si:H) are two types of flat-panel detectors with different technical characteristics.
• Assessing task-based image quality preferences is essential for optimizing diagnostic performance.

Purpose of the Study:

• To compare interventional radiologists' preferences for image quality between CMOS and a-Si:H flat-panel detectors.
• To evaluate detector performance across different imaging modalities (radiography, fluoroscopy, CBCT) and dose settings.
• To determine how detector type impacts the visibility of anatomical structures and interventional devices.

Main Methods:

• Three interventional radiologists evaluated side-by-side images from CMOS and a-Si:H detectors on mobile C-arms.
• Images acquired included radiographic, fluoroscopic, and cone-beam computed tomography (CBCT) of cadavers.
• Radiologists ranked preferences based on task performance, visibility of anatomy, and devices at low and high dose settings.

Main Results:

• CMOS detectors were preferred for fluoroscopy and CBCT, particularly at low-dose settings.
• CMOS images were favored for tasks demanding high spatial resolution, such as visualizing fine anatomical details and interventional devices.
• No significant differences were observed for radiography, high-dose settings, or tasks focused on general anatomy or temporal resolution.

Conclusions:

• CMOS flat-panel detectors offer superior image quality for specific interventional radiology tasks compared to a-Si:H detectors.
• The preference for CMOS is linked to its technical advantages, including finer pixel size and lower electronic noise.
• These findings support the use of CMOS detectors to enhance diagnostic accuracy in interventional radiology procedures requiring detailed visualization.