Dual- and multi-energy CT: approach to functional imaging

Fornaro, Jürgen; Leschka, Sebastian; Hibbeln, Dennis; Butler, Anthony; Anderson, Nigel G.; Pache, Gregor; Scheffel, Hans; Wildermuth, Simon; Alkadhi, Hatem; Stolzmann, Paul

doi:10.1007/s13244-010-0057-0

Cited by 160 publications

(126 citation statements)

References 55 publications

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“…25 Multi-energy imaging approaches functional imaging by identifying materials with an increased accuracy. 27 Dual energy can be used to lessen metal artefacts by reconstructing images with optimal energy levels. However, in our study, we found only slight benefit of using dual energy in its current state.…”

Section: Discussionmentioning

confidence: 99%

CT of facial fracture fixation: an experimental study of artefact reducing methods

Peltola¹,

Mäkelä²,

Haapamäki³

et al. 2017

Dentomaxillofacial Radiology

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Objectives: This study aimed to determine the optimal post-operative CT imaging method that enables best visualization of facial bony structures in the vicinity of osteosynthesis material. Methods: Conducted at Töölö Hospital (Helsinki, Finland), this study relied on scanning a phantom with CBCT, 64-slice CT and high-definition multislice CT with dual-energy scan (providing monochromatic images of 70-, 100-, 120-and 140-keV energy levels) and iterative reconstruction (IR) methods. Two radiologists assessed the image quality, and the assessments were analyzed. In addition, a physicist performed a semi-quantitative analysis of the metalinduced artefacts. Results: The three subjects most easily assessed were the loose screw and both the bone structure and the fracture further away from the screw and the plate. Soft tissues adjacent to the screw and the plate remained more difficult for assessment. Both image interpreters agreed that the artefacts disturbed their assessments under dual energy. Metal artefacts disturbed the least under multislice CT with IR [adaptive statistical iterative reconstruction (ASiR) and VEO]. Neither interpreter found metal suppression helpful in CBCT. Conclusions: CBCT with or without a metal artefact reduction algorithm was not optimal for post-operative facial imaging compared with multislice CT with IR. Multislice CT with ASiR filtering offered good image quality performance with fast image volume reconstruction, representing the current sweet spot in post-operative maxillofacial imaging.

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Section: Discussionmentioning

confidence: 99%

CT of facial fracture fixation: an experimental study of artefact reducing methods

Peltola¹,

Mäkelä²,

Haapamäki³

et al. 2017

Dentomaxillofacial Radiology

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“…Many summary articles [2][3][4] exist to provide thorough basic and moderately advanced understanding of the associated principles and mathematics.…”

Section: Principlesmentioning

confidence: 99%

“…Typically encountered materials such as calcium, iodine, and water possess sufficiently different linear attenuation at low and high energies to allow for good discrimination (primarily based on the lower useful energies where the photoelectric effect dominates). However, materials with very similar attenuation curves, such as soft tissue, fat and water, are more problematic and require more advanced analytical techniques (beam prefiltering, three compartment analysis [4]). …”

Section: Principlesmentioning

confidence: 99%

Dual Energy CT Application in the Abdomen

Bolus

2013

Curr Radiol Rep

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The evolution of dual energy computed tomography (DECT) and associated clinical advances continue to permeate the landscape of abdominal imaging. This article reviews general topics and recent contributions pertinent to progressive clinical implementation of this technology. Recent studies underscore the recognition of the dependence of the Hounsfield unit (HU) on keV and the resultant need for the translation of traditional diagnostic criteria. Similarly, critical assessment of virtual unenhanced imaging and its potential to replace true non-contrast imaging has been reflected in a number of studies that explore this critical radiation dose control function. The introduction of novel protocols includes the use of biphasic contrast technique, which, coupled with material discrimination, highlight capabilities unique to the DECT technique.

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“…This makes it possible to analyse the iodine uptake of tissues or organs directly and effectively reflect the blood perfusion state of tissues or organs. 6,8 A recent study 9 has investigated the performance of spectral CT in depicting the superior mesenteric artery (SMA). It is of great importance to explore the diagnostic value of sDECT in SMAE.…”

Section: Introductionmentioning

confidence: 99%

Imaging of acute superior mesenteric artery embolus using spectral CT in a canine model

Wang

Xiang-sheng

Zhang

et al. 2015

BJR

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Objective: To explore the diagnostic value of single-source dual-energy spectral CT (sDECT) imaging in an acute superior mesenteric artery embolus (SMAE) canine model. Methods: Pre-contrast and double-phase contrastenhanced sDECT were performed before and after embolization in eight SMAE dog models. Monochromatic images of embolized intestine with the best contrastto-noise ratio (CNR) were obtained and compared with the polychromatic images. CT parameters including attenuation value, iodine content, water content and thickness of the embolized intestinal segments were obtained, and normalized difference in iodine concentration (NDIC) was calculated. Results: The CNR in pre-contrast, arterial phase and portal venous phase at 4 h after embolization was 1.11 6 1.23, 13.50 6 1.54 and 10.63 6 3.75, respectively, significantly higher than those of the polychromatic images (p , 0.05).The iodine-based images clearly revealed the embolized intestinal segments, which were highly consistent with the gross findings. The difference in attenuation values between the embolization area and non-embolization area in the monochromatic images was 105.06 6 35.35 HU, higher than that in the polychromatic images (p , 0.001). The attenuation values and NDIC were significantly decreased at 2 h after embolization, relatively increased at 4 h and gradually decreased at 6 and 8 h. The changing pattern of thickness was similar to that of NDIC over time after embolization. Conclusion: sDECT can provide the optimal monochromatic images and allow increased detection rates of lesions. sDECT is a very promising tool for quantitative diagnosis of SMAE. Advances in knowledge: Our research provides more quantitative parameters for the assessment of SMAE by sDECT.

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Dual- and multi-energy CT: approach to functional imaging

Cited by 160 publications

References 55 publications

CT of facial fracture fixation: an experimental study of artefact reducing methods

CT of facial fracture fixation: an experimental study of artefact reducing methods

Dual Energy CT Application in the Abdomen

Imaging of acute superior mesenteric artery embolus using spectral CT in a canine model

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