Photon Counting Computed Tomography With Dedicated Sharp Convolution Kernels

Spiczak, Jochen von; Mannil, Manoj; Peters, Benjamin; Hickethier, Tilman; Baer, Matthias; Henning, André; Schmidt, Bernhard; Flohr, Thomas; Manka, Robert; Maintz, David; Alkadhi, Hatem

doi:10.1097/rli.0000000000000485

Cited by 66 publications

(62 citation statements)

References 24 publications

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“…These have demonstrated not only the ability to produce images with higher spatial resolution, as expected from the smaller pixel size, but also the clinical value of such images. 10,12,[34][35][36][37] Higher spatial resolution is expected to improve the diagnostic quality in several CT applications, including imaging of the temporal bone, lung nodule characterization, visualization of calcified plaques, and imaging of bone fractures in trauma patients. 6 Here, we aim to demonstrate that deep silicon-based, photon-counting detectors offer similar benefits in terms of image resolution and thus that silicon may constitute a viable alternative for future photon-counting CT detectors.…”

Section: Introductionmentioning

confidence: 99%

Resolution characterization of a silicon-based, photon-counting computed tomography prototype capable of patient scanning

et al. 2019

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Photon-counting detectors are expected to bring a range of improvements to patient imaging with x-ray computed tomography (CT). One is higher spatial resolution. We demonstrate the resolution obtained using a commercial CT scanner where the original energy-integrating detector has been replaced by a singleslice, silicon-based, photon-counting detector. This prototype constitutes the first full-field-of-view silicon-based CT scanner capable of patient scanning. First, the pixel response function and focal spot profile are measured and, combining the two, the system modulation transfer function is calculated. Second, the prototype is used to scan a resolution phantom and a skull phantom. The resolution images are compared to images from a state-ofthe-art CT scanner. The comparison shows that for the prototype 19 lp∕cm are detectable with the same clarity as 14 lp∕cm on the reference scanner at equal dose and reconstruction grid, with more line pairs visible with increasing dose and decreasing image pixel size. The high spatial resolution remains evident in the anatomy of the skull phantom and is comparable to that of other photon-counting CT prototypes present in the literature. We conclude that the deep silicon-based detector used in our study could provide improved spatial resolution in patient imaging without increasing the x-ray dose.

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Section: Introductionmentioning

confidence: 99%

Resolution characterization of a silicon-based, photon-counting computed tomography prototype capable of patient scanning

et al. 2019

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“…And thus, we still advise an appropriate dose of beta blocker for HR control, before the CCTA examination. About the technological advantages of these two CT devices, the 2nd generation (128-slice) dual-source CT (Siemens) is composed by two sets of independently operating X-ray tubes and 64 row detectors, it finishes a cardiac scanning at 280 ms 17. Using single sector reconstruction, the temporal resolution is 75 ms.…”

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confidence: 99%

Comparison on radiation effective dose and image quality of right coronary artery on prospective ECG‐gated method between 320 row CT and 2nd generation (128‐slice) dual source CT

Hou

Huang

et al. 2020

J Applied Clin Med Phys

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This retrospective study was to compare the image quality of right coronary artery (RCA) and effective radiation dose on prospective ECG-gated method between 320 row computed tomography (CT) and 2nd generation (128-slice) dual source CT. A total of 215 candidates underwent CT coronary angiography using prospective ECG-gated method, 120 patients enrolled in 320 row CT group, and 95 patients in dual source CT group. We divided RCA image quality scores as 1/2/3/4, which means excellent/good/adequate/not assessable and heart rates were considered, as well as the radiation dose. There is no statistically significant difference of RCA image quality of Score 1/2 between 320 row CT and 2nd generation dual source CT, but lower heart rate (<70/min) improved RCA image quality. Meanwhile, the 2nd generation dual source CT scan have significant lower radiation dose. For patients with high level heart rate variation, both prospective ECG-gated method of 320 row CT scan (Toshiba) and 2nd generation dual source CT scan (Siemens) basically provided good image quality on RCA. There is an advantage of effective radiation dose reduction in prospective ECG-gated method using the 2nd generation dual source CT scan. After the iodine contrast agent was injected into elbow vein, the threshold triggering method was used to carry out prospective gated scanning, and the acquired fault image was reconstructed by the standard post-processing software of each manufacturer. The radiation dose value is obtained through the dose report automatically generated after each scan.

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“…In a phantom experiment, Symons et al [55] demonstrated significantly improved coronary stent lumen visibility with the "UHR mode". Von Spiczak et al [62] found superior qualitative and quantitative image characteristics for photon-counting coronary photon-counting detector image, "sharp mode", demonstrating higher spatial resolution and significantly improved visualization of bony structures. With permission from [26] stent imaging when using a dedicated sharp convolution kernel.…”

Section: Pre-clinical Evaluation Of Photon-counting Ctmentioning

confidence: 99%

Basic principles and clinical potential of photon-counting detector CT

et al. 2020

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Photon-counting detectors are a new technology for future computed tomography (CT) systems, with the potential to overcome major limitations of conventional CT detectors. They provide energy-resolved CT data at very high spatial resolution without electronic noise. This review article gives an overview of the basic principles of photon-counting detector CT, of potential benefits and limitations, and of the clinical experience gained so far in pre-clinical installations.

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Photon Counting Computed Tomography With Dedicated Sharp Convolution Kernels

Cited by 66 publications

References 24 publications

Resolution characterization of a silicon-based, photon-counting computed tomography prototype capable of patient scanning

Resolution characterization of a silicon-based, photon-counting computed tomography prototype capable of patient scanning

Comparison on radiation effective dose and image quality of right coronary artery on prospective ECG‐gated method between 320 row CT and 2nd generation (128‐slice) dual source CT

Basic principles and clinical potential of photon-counting detector CT

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