UHR

Ultra-high-resolution (UHR) photon-counting coronary CT angiography demonstrated significantly higher precision than standard-resolution (SR) PCCT for quantifying coronary stenosis, particularly in heavily calcified vessels. Compared with invasive 3D quantitative coronary angiography (QCA), UHR-PCCT reduced median stenosis…

A tailored PCCT coronary CTA protocol achieved 90% fully diagnostic examinations, significantly outperforming the previous EID-CT protocol (78%), despite imaging an older population with substantially higher coronary calcium burden. Diagnostic image quality remained high even in heavily calcified patients, with 77% of…

Dr. Leena Sulaibeekh, Dr. Mary AI-Teraif, Dr. Rajesh Jayakumar, Dr. Mohammed Ali Zayed, Dr. Chetan Narayana, and Dr. Mohammed Faizal Mohammed Bin Khalifa Bin Salman Al Khalifa Specialist Cardiac Centre (MKCC), Bahrain June 3, 2026 lntroduction Cardiovascular care and imaging requirements have undergone a significant…

A single-session PCCT workflow successfully combined coronary CTA, carotid imaging, lung assessment, and delayed cardiac imaging within one consolidated examination. The protocol integrated UHR coronary PCCTA (0.2 mm) with a high-pitch thoraco-cervical acquisition (0.4 mm), maintaining diagnostic image quality while…

PCCT enabled millimeter-scale, layer-specific quantification of carotid perivascular adipose tissue using concentric 1–5 mm annular segmentation. PVAT attenuation decreased progressively with increasing distance from the carotid wall, with significant differences especially between the 1 mm layer and the 3–5 mm layers.…

PCCT showed higher interrater agreement than conventional CT for key structural features in capitellar osteochondritis dissecans. The number of loose bodies and the presence of an osseous bridge demonstrated significantly improved agreement with PCCT compared to conventional CT. Despite higher spatial resolution, several…

PCCT improved CVF detection sensitivity without a significant specificity penalty. Across all three readers, sensitivity was significantly higher for PCCT myelography than for EID-CT myelography, while specificity did not differ significantly. The authors attribute the diagnostic gain mainly to much higher spatial…

Dr. Mustafa Al-Gazzawi, Senior Specialist (Diagnostic Radiology) Dr. Thair S. Abdulla , Head of Radiology, Consultant Radiologist Courtesy of Al‑Ahli Hospital, Doha, Qatar. College of Medicine, QU Health, Qatar University, Doha, Qatar April 13, 2026 Abstract Small bowel ischemia remains difficult to diagnose early,…

PCCT significantly improved specificity, PPV, and overall diagnostic accuracy for obstructive CAD compared to EID-CT, while maintaining equally high sensitivity and NPV. Fewer patients were referred to invasive coronary angiography after PCCT, but those referred were more likely to undergo revascularization, indicating…

Combined spectral and UHR PCCT improved coronary stent assessment by balancing maximum spatial detail with more stable spectral reconstructions. UHR images provided the best lumen visibility and lowest strut overestimation at 60 bpm, but image quality declined at higher heart rates because of motion sensitivity. Spectral…

UHR dual-source PCCT delivered at least good image quality in 94% of coronary segments and very good or excellent quality in 85%, despite relatively high heart rates. Image quality for coronary stents was particularly strong, with 92% of stented segments rated excellent. Only limited motion, stack, and metal artifacts were…

The novel ZeeFree reconstruction significantly reduced the frequency and severity of stair-step artifacts in sequential UHR coronary PCCTA. Most coronary segments that were nondiagnostic due to stair-step artifacts on standard reconstruction became diagnostic with ZeeFree, without compromising noise, SNR, or CNR. Heart…

UHR photon-counting CCTA achieved high diagnostic accuracy for detecting CAD in a high-risk TAVR population, despite severe calcification and prior stent placement. Image quality was excellent overall, with 97.8% of coronary segments rated diagnostic and 79% rated good or excellent. The study suggests that UHR PCCT may…

Ultra-high-resolution PCCT reconstructions reduced apparent calcified plaque burden and increased visualization of non-calcified plaque components compared with standard reference reconstructions. The combination of 0.2 mm slice thickness and the sharp Bv64 kernel yielded the lowest calcified plaque fraction and the…

Compared with standard-resolution (SR) PCCTA, ultrahigh-resolution (UHR) PCCTA achieved clearly stronger correlation with invasive FFR and higher diagnostic accuracy for functionally significant stenosis. UHR-PCCTA-derived FFR maintained performance in heavily calcified and diffusely diseased vessels, where…

The study evaluates a low-dose ultra-high-resolution (UHR) PCCT lung protocol in a clinical cohort to determine optimal reconstruction settings for image quality. It demonstrates that image quality is primarily driven by reconstruction parameters, with a 1024 matrix, 0.4 mm slice thickness, sharp lung kernel (Bl64), and…

This study used a modified chest PCCT workflow with an inspiratory scan followed by an expiratory scan 5 minutes later after IV contrast administration. The protocol was designed to derive lung morphology, vasculature, perfusion, ventilation, and late contrast enhancement from one examination. In 166 of 196 patients, all…

The study demonstrates that ultra-high-pitch PCCT can enable reliable diagnosis of acute pulmonary embolism even under free-breathing conditions. Using a low contrast volume and fast acquisition, the protocol achieves superior image quality while simultaneously reducing radiation dose compared to conventional CT. The…

Jingyi Liu, MD*; Prof. Liang Zhu, MD*; Xi Zhao, MD**; Prof. Feng Feng, MD* * Department of Radiology, Peking Union Medical College, Beijing, P. R. China** Siemens Healthineers, China October 24, 2025 Download pdf History A 47-year-old male patient, complaining of persistent upper abdominal pain for the past month,…

Jiaxu Wei, RT*; Xiao Li, MD*; Huilin Zhao, MD*; Shenghao Ding, MD**; Lang Liu, MD**; Xi Zhao, MD***; Yan Zhou, MD* * Department of Radiology, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, P. R. China** Department of Neurosurgery, Renji Hospital, Shanghai Jiao Tong University School of…

Le Qin, MD, PhD*; Haipeng Dong, MD*; Fuhua Yan, MD, PhD*,**; Xi Zhao, MD***; Wenjie Yang, MD, PhD* * Department of Radiology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, P. R. China** College of Health Science and Technology, Shanghai Jiao Tong University School of Medicine, Shanghai, P. R.…

Antonella Del Gaudio, MD; Daniele Marin, MD Department of Radiology, Duke University, Durham, NC, USA November 6, 2024 Download pdf History A 63-year-old female patient (BMI 19.57 kg/m²), with a history of hypothyroidism, fatigue, weakness, loss of appetite and hypoglycemia, was referred to the Department of Radiology for…

Chao Zhang, RT*; Daming Zhang, MD*; Man Wang, RT*; Jin Chen, RN*; Xi Zhao, MD**; Yun Wang, RT* * Department of Radiology, Peking Union Medical College, Beijing, P. R. China** Siemens Healthineers, China August 28, 2024 Download pdf History A 32-year-old female patient, suffering from bilateral symptomatic breast…

Jie Liu, RT*; Yanbo Gu, RT*, Yonggao Zhang, MD*; Jianbo Gao, MD*; Xi Zhao, MD** * Department of Radiology, The First Affiliated Hospital of Zhengzhou University, Henan, P. R. China** Siemens Healthineers, China August 21, 2024 Download pdf History A 60-year-old male patient, complaining of intermittent chest pain and…

Yujie Gao, MD*; Song Luo, MD*; Xi Zhao, MD** * Department of Radiology, Geriatric Hospital of Nanjing Medical University, Jiangsu, P. R. China** Siemens Healthineers, China July 31, 2024 Download pdf History A 76-year-old male patient, complaining of palpitations and chest tightness, was presented to the hospital. Fourteen…

Lili Száraz, MD; Prof. Pál Maurovich-Horvat, MD, PhD, MPH; Bálint Szilveszter, MD, PhD Semmelweis University, Medical Imaging Center, Budapest, Hungary July 10, 2024 Download pdf History A 46-year-old male patient, complaining of atypical chest pain, presented himself to the hospital. He had an elevated cardiovascular risk…