UHR

In this retrospective cohort of 159 patients with subarachnoid haemorrhage, UHR PCCT substantially improved lenticulostriate artery (LSA) visualization compared with conventional EID-CTA. For branches arising >5 mm from the MCA origin, PCCT detection approached DSA—for example, 93% vs 85% for observer 1 in the left…

In this selected pilot cohort of 20 complex neurosurgical cases, UHR PCCT provided additional anatomical information beyond conventional MRI/CT, particularly for arterial anatomy (11/20, 55%), tumor vascular supply (7/20, 35%), venous anatomy (6/20, 30%), and skull-base/orbital/osseous involvement (8/20, 40%). The greatest…

Xiangyu Liu, RT*; Jiaxu Wei, RT*; Xi Zhao, MD**; Ji Wang, RT* * Department of Radiology, Shanghai Jiao Tong University School of Medicine Affiliated Renji Hospital, Shanghai, P. R. China** Siemens Healthineers, China 2025-07-02 Download pdf History A 15-year-old male patient, complaining of a growing lump on the right of…

This study combined physical phantom testing of 11 UHR reconstruction kernels (Hr60–Hr98) with clinical visual assessment in 12 patients / 24 temporal bones. Physically, increasing kernel sharpness improved spatial resolution but increased high-frequency noise: Hr96 achieved the highest measured resolution, whereas Hr60…

In 71 post-TAVI PCCT examinations from 63 patients, time-resolved cardiac PCCT enabled calculation of prosthetic-valve hemodynamics from left-ventricular volumetry and direct valve-orifice planimetry. CT-derived mean and maximum transvalvular gradients correlated strongly with echocardiography (ρ = 0.85 for both), while…

In 25 consecutive patients with Cushing disease undergoing transsphenoidal surgery, dynamic pituitary PCCT localized corticotroph adenomas substantially more accurately than preoperative MRI: 92% vs 56%, respectively (p = .01). PCCT identified a lesion in 24/25 patients, with only one misleading localization. The gain was…

This early case series illustrates how UHR PCCT can improve structural heart imaging before and after TAVR, particularly through sharper depiction of the aortic valve, annulus, coronary arteries, prosthetic valve frames, and vascular access routes. UHR acquisition allows 0.2-mm sections, compared with 0.4 mm in the regular…

In 69 patients with 131 coronary stents, UHR PCCT with 0.2-mm slices significantly improved in-stent lumen visualization and reduced blooming artifacts compared with standard-resolution 0.6-mm reconstruction. Among the evaluated reconstruction kernels, Bv72 provided the best overall performance, improving visualization of…

In 51 patients with 51 coronary plaques, PCCT VMI energy had a substantial effect on measured plaque attenuation and consequently on quantitative plaque composition when fixed HU thresholds were used. Mean plaque attenuation fell progressively from 723 ± 501 HU at 40 keV to 120 ± 112 HU at 180 keV, while 70-keV VMI most…

The case report hase been published by: Tateishi, R, Nishimura, T, Tao, S. et al. Photon-Counting Detector Computed Tomography Depicts a Ventricular Tachycardia Substrate: Periaortic Septal Intramural Late Iodine Enhancement. J Am Coll Cardiol Case Rep. 2026 Apr, 31 (15) . https://doi.org/10.1016/j.jaccas.2026.107250 Check…

In 18 patients with 44 coronary stents, ultra-high-resolution (UHR) PCCT angiography achieved high diagnostic accuracy for detecting ≥50% in-stent stenosis compared with invasive coronary angiography (ICA). Both readers identified all 5 stenotic stents, yielding 100% sensitivity. Specificity and overall accuracy were 92.3%…

This prospective study compared 0.2-mm ultra-high-resolution (UHR) PCCT with 1-mm standard-resolution 40-keV VMI for abdominal CTA in 94 participants, equally divided between full-dose and low-dose protocols. Standard-resolution 40-keV VMI provided significantly higher SNR and CNR than all UHR reconstructions. UHR…

Prospective study testing whether low-dose (LD) ultra-high-resolution (UHR) photon-counting CT can preserve diagnostic image quality for visceral artery CTA. The study included 57 patients in the full-dose group and 57 in the low-dose group. Each acquisition was reconstructed two ways: 0.2 mm / Bv48 / QIR 4 and 1 mm / Bv40…

This multicenter retrospective study evaluated 6,464 PCCT examinations in 4,772 pediatric patients across three French institutions and provides practical acquisition/reconstruction protocols across ten body regions. The cohort had a mean age of 7.9 ± 5.5 years (4 days–17.9 years); nearly one-third of examinations involved…

Combining UHR PCCT with low-keV virtual monoenergetic imaging (VMI) improved visualization of pancreatic ductal adenocarcinoma (PDAC), peripancreatic vessels, and fine pancreatic anatomy; the study identified 0.4-mm slices at 45 keV as the best overall reconstruction strategy for preoperative assessment. 40-keV VMI…

A novel spectral black-blood CT (BBCT) reconstruction used the spectral information from PCCT to suppress intraluminal iodine from a routine single-phase CTA dataset, enabling high-resolution carotid vessel wall imaging without an additional scan, contrast administration, or dedicated acquisition. Compared with…

This proof-of-concept study is described as the first clinical PCCT study to characterize high-risk human carotid plaque features in living patients, using histology from subsequent carotid endarterectomy as the reference. The cohort comprised 10 symptomatic patients. Spectral PCCT could differentiate multiple plaque…

A streamlined PCCT myelography protocol enabled whole-spine evaluation at 0.2 × 0.1 mm resolution while limiting scanner time to approximately 15 minutes, making high-resolution CSF leak imaging feasible in a busy clinical setting. In 35 patients with previously inconclusive spine imaging, PCCT definitively identified a…

Access publication Key takeaways UHR PCCTA significantly improved the assessment of calcified coronary stenoses by reducing calcium blooming artifacts, resulting in more accurate stenosis quantification than standard-resolution CCTA. Compared with standard-resolution imaging, UHR PCCTA reclassified 54.4% of patients to a…

This phantom study demonstrates that ultra-high-resolution (UHR) photon-counting CT (PCCT) substantially improves visualization of low-attenuation plaque (LAP) compared with standard-resolution PCCT and a clinically used energy-integrating detector CT (EID-CT) protocol. The combination of UHR acquisition (120 × 0.2 mm…

Ultra-high-resolution (UHR) photon-counting CT pulmonary angiography significantly improved visualization of peripheral pulmonary arteries and increased radiologists' diagnostic confidence compared with state-of-the-art dual-energy EID-CT. UHR-PCD-CT achieved substantially higher pulmonary arterial enhancement (568–623 HU…

Among all seven available iterative metal artifact reduction (IMAR) presets, the IMARDental preset unexpectedly provided the strongest reduction of metal artifacts around total knee endoprostheses during ultra-high-resolution photon-counting CT angiography. IMARDental significantly improved objective artifact reduction and…

Ultra-high-resolution (UHR) coronary CTA with photon-counting CT was feasible in patients with a high coronary calcium burden, providing improved visualization of calcified plaques and adjacent coronary lumen compared with conventional 0.6 mm reconstructions. Reconstruction kernel selection proved critical. Moderate sharp…