Monday, November 26 | 12:15 p.m.-12:45 p.m. | PH214-SD-MOA5 | Lakeside, PH Community, Station 5
Researchers are developing a new high-capacity x-ray tube designed to increase dose efficiency and improve image quality for low-energy, contrast-enhanced CT scans.Justin Solomon, PhD, a radiation physicist at Duke University Health System, is scheduled to present the study, which tested the next-generation, high-capacity x-ray tube against a standard-capacity x-ray tube on a multisized phantom (Mercury 4.0,Gammex). A routine 120-kV abdominopelvic protocol compared the performance of the tubes at 70 kV, 80 kV, and 120 kV. The evaluations included the x-ray tubes' noise power spectrum, dose efficiency, spatial frequency, iodine contrast, and detectability index using image quality analysis software.
The results showed promise for the high-capacity x-ray tube, with dose efficiency estimated at 33 mGy, 32 mGy, and 21 mGy for 70 kV, 80 kV, and 120 kV, respectively. This indicates that low-kV imaging is potentially more dose-efficient for detecting 5-mm lesions, for example.
The x-ray tube's higher maximum output capacity also resulted in a 16% and 10% increase in the diameter of the largest patient that could be imaged at 70 kV and 80 kV, respectively. Additional image quality improvements for larger patients may also be possible using further optimizations of current protocol settings, the researchers speculated.
Perhaps most important, the new x-ray tube achieved comparable image resolution in the routine abdominopelvic protocol.
![Axial images from unenhanced calcium score cardiac CT (left) and curved planar reformation images from CT angiography (right) show that higher long-term exposure to air pollution is associated with greater coronary artery calcium and more obstructive coronary artery disease (CAD). Top row: Images in a 68-year-old male patient with higher 10-year mean ambient air pollution exposure (7.9 μg/m3 for particulate matter measuring ≤2.5 μm in diameter [PM2.5] and 17.4 parts per billion [ppb] for NO2) with extensive CAD (coronary artery calcium score [CACS] >1,000 and obstructive CAD [≥70% diameter stenosis]). Bottom row: Images in a 57-year-old female patient with lower 10-year mean ambient air pollution exposure (6.3 μg/m3 for PM2.5 and 4.6 ppb for NO2) with no CAD (CACS = 0 and no obstructive stenosis).](https://img.auntminnie.com/mindful/smg/workspaces/default/uploads/2026/06/hanneman.r6SMLzkezo.png?auto=format%2Ccompress&dpr=2&fit=crop&h=167&q=70&w=250)
