Role of spectral-detector CT in reduction of artifacts from contrast media in axillary and subclavian veins: single institution study in 50 patients
| Autor: | Frank Philipp Graner, Nikhil H. Ramaiya, Nils Große Hokamp, Kai Roman Laukamp, Robert C. Gilkeson, Amit Gupta, Pablo R. Ros, Vivian Ho, Verena Carola Obmann |
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| Rok vydání: | 2019 |
| Předmět: |
Adult
Male media_common.quotation_subject medicine.medical_treatment Contrast Media Subclavian Vein Iodinated contrast media medicine Contrast (vision) Humans Radiology Nuclear Medicine and imaging Single institution Axillary Vein Reduction (orthopedic surgery) media_common Aged Retrospective Studies Aged 80 and over Radiological and Ultrasound Technology business.industry General Medicine Middle Aged Radiographic Image Enhancement Diagnostic assessment Female Ct imaging Nuclear medicine business Artifacts Tomography X-Ray Computed |
| Zdroj: | Acta radiologica (Stockholm, Sweden : 1987). 61(4) |
| ISSN: | 1600-0455 |
| Popis: | Background In CT imaging, a high concentration of iodinated contrast media in axillary and subclavian veins after brachial application can cause perivenous artifacts impairing diagnostic assessment of local vascular structures and soft tissue. Purpose To investigate reduction of perivenous hypo- and hyperattenuating artifacts of the axillary and subclavian veins using virtual monoenergetic images (VMI) in comparison to conventional CT images (CI), acquired on spectral-detector CT. Material and Methods 50 spectral-detector CT datasets of patients with perivenous artifacts from contrast media were included in this retrospective, institutional review board-approved study. CT images and virtual monoenergetic images (range 40–200 keV, 10-keV increments) were reconstructed from the same scans. Quantitative analysis was performed by region of interest-based assessment of mean attenuation (HU) and standard deviation in most pronounced hypo- and hyperdense artifacts and artifact-impaired arteries as well as muscle. Visually, artifact reduction, assessment of vessels, and surrounding soft tissue were rated on 5-point Likert-scales by two radiologists. Results In comparison to CT images, virtual monoenergetic images of ≥90 keV showed a significant reduction of hypo- and hyperattenuating artifacts (hypodense: CI -220.0±171.2 HU; VMI130keV -13.4±49.1 HU; hyperdense: CI 274.6±184.4 HU; VMI130keV 24.2±84.9 HU; P130keV 5[4–5], hyperdense: CI 2[1–4]; VMI130keV 5[5–5], PConclusion Higher keV virtual monoenergetic images yielded significant reduction of contrast media artifacts and led to improved assessment of vessels and surrounding soft tissue. Recommended keV values for best diagnostic assessment are in the range of 100–160 keV. |
| Databáze: | OpenAIRE |
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