Combining iterative metal artifact reduction and virtual monoenergetic images severely reduces hip prosthesis-associated artifacts in photon-counting detector CT

Layer, Y; Mesropyan, Narine; Kupczyk, Patrick; Luetkens, Julian A.; Isaak, Alexander; Dell, Tatjana; Attenberger, Ulrike; Kuetting, Daniel

doi:10.1038/s41598-023-35989-6

Cited by 18 publications

(11 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While artifacts remain a challenge in medical imaging, the introduction and development of photon counting CT technology represent a promising advancement in overcoming these issues. The unique properties of photon counting detectors provide a pathway to significantly improved image quality, reducing artifacts and potentially transforming CT imaging into an even more powerful diagnostic tool [ 24 , 25 , 26 ].…”

Section: Discussionmentioning

confidence: 99%

Three-Dimensional Visualization of Shunt Valves with Photon Counting CT and Comparison to Traditional X-ray in a Simple Phantom Model

Klempka,

Clausen,

Soltane

et al. 2024

Tomography

View full text Add to dashboard Cite

This study introduces an application of innovative medical technology, Photon Counting Computer Tomography (PC CT) with novel detectors, for the assessment of shunt valves. PC CT technology offers enhanced visualization capabilities, especially for small structures, and opens up new possibilities for detailed three-dimensional imaging. Shunt valves are implanted under the skin and redirect excess cerebrospinal fluid, for example, to the abdominal cavity through a catheter. They play a vital role in regulating cerebrospinal fluid drainage in various pathologies, which can lead to hydrocephalus. Accurate imaging of shunt valves is essential to assess the rate of drainage, as their precise adjustment is a requirement for optimal patient care. This study focused on two adjustable shunt valves, the proGAV 2.0® and M. blue® (manufactured by Miethke, Potsdam, Germany). A comprehensive comparative analysis of PC CT and traditional X-ray techniques was conducted to explore this cutting-edge technology and it demonstrated that routine PC CT can efficiently assess shunt valves’ adjustments. This technology shows promise in enhancing the accurate management of shunt valves used in settings where head scans are already frequently required, such as in the treatment of hydrocephalus.

show abstract

Section: Discussionmentioning

confidence: 99%

Three-Dimensional Visualization of Shunt Valves with Photon Counting CT and Comparison to Traditional X-ray in a Simple Phantom Model

Klempka,

Clausen,

Soltane

et al. 2024

Tomography

View full text Add to dashboard Cite

show abstract

“…The main limitation of the current study is that the results from the photon-counting CT scanner were not compared with a conventional CT scanner with energy-integrating detector. Although clinical data were not evaluated as part of this study, and clinical implants can be more complex in shape, size, and composition than the evaluated metal rods, the results show good agreement with previous clinical studies on metal artifact reduction in PCD-CT. [17][18][19][20][21] In addition, the evaluation was focused on ROI measurements in preselected positions. Further studies should also investigate the impact of metal artifacts on clinical tasks, for example, diagnostic performance.…”

Section: Discussionmentioning

confidence: 99%

“…Previous studies have found good performance for both iterative metal artifact reduction (iMAR) and VMI in clinical patient data. [17][18][19][20][21] However, patient studies have their own limitations as they do not allow for an investigation of different acquisition parameters (eg, tube potential) or different types of metal and lack a ground truth dataset for comparison. Furthermore, intraindividual differences between patients prohibit an accurate assessment of the impact of metal artifacts on quantitative CT-number accuracy in different tissues.…”

mentioning

confidence: 99%

Metal Artifact Reduction in Photon-Counting Detector CT

Skornitzke,

Mergen,

Biederer

et al. 2023

Invest Radiol

View full text Add to dashboard Cite

Objectives With the introduction of clinical photon-counting detector computed tomography (PCD-CT) and its novel reconstruction techniques, a quantitative investigation of different acquisition and reconstruction settings is necessary to optimize clinical acquisition protocols for metal artifact reduction. Materials and Methods A multienergy phantom was scanned on a clinical dual-source PCD-CT (NAEOTOM Alpha; Siemens Healthcare GmbH) with 4 different central inserts: water-equivalent plastic, aluminum, steel, and titanium. Acquisitions were performed at 120 kVp and 140 kVp (CTDIvol 10 mGy) and reconstructed as virtual monoenergetic images (VMIs; 110–150 keV), as T3D, and with the standard reconstruction “none” (70 keV VMI) using different reconstruction kernels (Br36, Br56) and with as well as without iterative metal artifact reduction (iMAR). Metal artifacts were quantified, calculating relative percentages of metal artifacts. Mean CT numbers of an adjacent water-equivalent insert and different tissue-equivalent inserts were evaluated, and eccentricity of metal rods was measured. Repeated-measures analysis of variance was performed for statistical analysis. Results Metal artifacts were most prevalent for the steel insert (12.6% average artifacts), followed by titanium (4.2%) and aluminum (1.0%). The strongest metal artifact reduction was noted for iMAR (with iMAR: 1.4%, without iMAR: 10.5%; P < 0.001) or VMI (VMI: 110 keV 2.6% to 150 keV 3.3%, T3D: 11.0%, and none: 16.0%; P < 0.001) individually, with best results when combining iMAR and VMI at 110 keV (1.2%). Changing acquisition tube potential (120 kV: 6.6%, 140 kV: 5.2%; P = 0.33) or reconstruction kernel (Br36: 5.5%, Br56: 6.4%; P = 0.17) was less effective. Mean CT numbers and standard deviations were significantly affected by iMAR (with iMAR: −3.0 ± 21.5 HU, without iMAR: −8.5 ± 24.3 HU; P < 0.001), VMI (VMI: 110 keV −3.6 ± 21.6 HU to 150 keV −1.4 ± 21.2 HU, T3D: −11.7 ± 23.8 HU, and none: −16.9 ± 29.8 HU; P < 0.001), tube potential (120 kV: −4.7 ± 22.8 HU, 140 kV: −6.8 ± 23.0 HU; P = 0.03), and reconstruction kernel (Br36: −5.5 ± 14.2 HU, Br56: −6.8 ± 23.0 HU; P < 0.001). Both iMAR and VMI improved quantitative CT number accuracy and metal rod eccentricity for the steel rod, but iMAR was of limited effectiveness for the aluminum rod. Conclusions For metal artifact reduction in PCD-CT, a combination of iMAR and VMI at 110 keV demonstrated the strongest artifact reduction of the evaluated options, whereas the impact of reconstruction kernel and tube potential was limited.

show abstract

“…It is very common, and it often limits the assessment of cervical structures or structures in the brain. Other clinical studies also suggested the combination of IMAR and VMI for metal artifact reduction in the hip [89] and for dental implants [90].…”

Section: Metal Artifact Reductionmentioning

confidence: 99%

Photon-counting detector CT – first experiences in the field of musculoskeletal radiology

Bette,

Risch,

Becker

et al. 2024

Rofo

View full text Add to dashboard Cite

The introduction of photon-counting detector CT (PCD-CT) marks a remarkable leap in innovation in CT imaging. The new detector technology allows X-rays to be converted directly into an electrical signal without an intermediate step via a scintillation layer and allows the energy of individual photons to be measured. Initial data show high spatial resolution, complete elimination of electronic noise, and steady availability of spectral image data sets. In particular, the new technology shows promise with respect to the imaging of osseous structures. Recently, PCD-CT was implemented in the clinical routine. The aim of this review was to summarize recent studies and to show our first experiences with photon-counting detector technology in the field of musculoskeletal radiology.We performed a literature search using Medline and included a total of 90 articles and reviews that covered recent experimental and clinical experiences with the new technology.In this review, we focus on (1) spatial resolution and delineation of fine anatomic structures, (2) reduction of radiation dose, (3) electronic noise, (4) techniques for metal artifact reduction, and (5) possibilities of spectral imaging. This article provides insight into our first experiences with photon-counting detector technology and shows results and images from experimental and clinical studies.Bette S, Risch F, Becker J et al. Photon-counting detector CT – first experiences in the field of musculoskeletal radiology. Fortschr Röntgenstr 2024; DOI 10.1055/a-2312-6914

show abstract

Combining iterative metal artifact reduction and virtual monoenergetic images severely reduces hip prosthesis-associated artifacts in photon-counting detector CT

Cited by 18 publications

References 28 publications

Three-Dimensional Visualization of Shunt Valves with Photon Counting CT and Comparison to Traditional X-ray in a Simple Phantom Model

Three-Dimensional Visualization of Shunt Valves with Photon Counting CT and Comparison to Traditional X-ray in a Simple Phantom Model

Metal Artifact Reduction in Photon-Counting Detector CT

Photon-counting detector CT – first experiences in the field of musculoskeletal radiology

Contact Info

Product

Resources

About