Assessment of an Advanced Monoenergetic Reconstruction Technique in Dual-Energy Computed Tomography of Head and Neck Cancer

Albrecht, Moritz H.; Scholtz, Jan-Erik; Kraft, Johannes; Bauer, Ralf W.; Kaup, Moritz; Dewes, Patricia; Bucher, Andreas; Burck, Iris; Wagenblast, Jens; Lehnert, Thomas; Kerl, J. Matthias; Vogl, Thomas J.; Wichmann, Julian L.

doi:10.1007/s00330-015-3627-1

Cited by 128 publications

(68 citation statements)

References 26 publications

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“…At low keV, the iodine attenuation increases in proximity to the k-edge energy, so the lesion-to-liver contrast increases inversely with energy. 22 Nonetheless, the noise is only mildly increased due to the frequency-split technique and consequently the CNR peaks at 40 keV. 22 This has been shown by several clinical studies on hypervascular lesion conspicuity, pancreas, and aorta visualizations.…”

Section: Discussionmentioning

confidence: 93%

“…Virtual monoenergetic imaging at 40 keV has several clinical benefits. At low keV, the iodine attenuation increases in proximity to the k‐edge energy, so the lesion‐to‐liver contrast increases inversely with energy . Nonetheless, the noise is only mildly increased due to the frequency‐split technique and consequently the CNR peaks at 40 keV .…”

Section: Discussionmentioning

confidence: 99%

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Optimizing window settings for improved presentation of virtual monoenergetic images in dual‐energy computed tomography

Marin

Ramírez-Giraldo

et al. 2017

Medical Physics

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Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Optimizing window settings for improved presentation of virtual monoenergetic images in dual‐energy computed tomography

Marin

Ramírez-Giraldo

et al. 2017

Medical Physics

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“…7). [63][64][65] CONCLUSIONS TAVR is an increasingly used alternative to SAVR in patients with severe aortic stenosis with a high risk for perioperative complications. Given present trends, improvements in the TAVR technique and valve prosthesis material are likely to expand the spectrum of patients eligible for TAVR, with a predicted "indication creep" to soon also include younger, healthier patients who now undergo SAVR.…”

Section: High-pitch Acquisitionmentioning

confidence: 99%

Transcatheter Aortic Valve Replacement

Wichmann

Varga-Szemes²,

Surányi³

et al. 2015

Journal of Thoracic Imaging

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Transcatheter aortic valve replacement (TAVR) is an increasingly used alternative to surgical aortic valve replacement in patients with severe aortic stenosis and prohibitive perioperative risk. Several studies have shown an improved clinical outcome and lower rate of complications with TAVR in this patient population. Furthermore, TAVR has shown promising results in patients at elevated risk from surgical aortic valve replacement. Because of the endovascular nature of this technique, comprehensive preprocedural assessment of the aortic root and vascular access path is crucial. Although echocardiography is still commonly performed to assess the aortic root, cross-sectional imaging modalities are increasingly used given their superior results in the diagnostic accuracy of TAVR measurements. In particular, computed tomography (CT) is gaining an increasing role in pre-TAVR imaging because of fast 3-dimensional assessment of aortic root anatomy and improvements in clinical outcome after TAVR when CT is used for pre-TAVR planning. However, different algorithms exist for matching valve size to the aortic root and left ventricular outflow tract, and these measurements may substantially impact valve prosthesis selection and postinterventional complication rates. Cardiac magnetic resonance may play a role especially in post-TAVR assessment, as it provides both anatomic information and blood flow dynamics. This article reviews multimodality imaging approaches to pre-TAVR aortic root size assessment, provides an overview of the impact on post-TAVR complications and clinical outcome, and describes recent techniques to reduce contrast material volume in TAVR assessment with CT.

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“…1). More recently, advanced algorithms for VMI are allowing an increased SNR at lower virtual energies by using an advanced calculation with the use of a split frequency filter [20, 21]. …”

Section: Dect Techniquementioning

confidence: 99%

“…The highest tumor attenuation was found at 40 keV with a superior CNR compared with the WA 0.3 images. However, subjectively VMI at 55 keV was preferred regarding image quality and tumor delineation [21]. Lam et al evaluated VMI reconstructions of the head and neck with a single source fast-kV switching DECT.…”

Section: Applicationsmentioning

confidence: 99%

Dual-Energy CT in Head and Neck Imaging

et al. 2017

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Purpose of ReviewTo explain the technique of Dual-energy CT (DECT) and highlight its applications and advantages in head and neck radiology.Recent FindingsUsing DECT, additional datasets can be created next to conventional images. In head and neck radiology, three material decomposition algorithms can be used for improved lesion detection and delineation of the tumor. Iodine concentration measurements can aid in differentiating malignant from nonmalignant lymph nodes and benign posttreatment changes from tumor recurrence. Virtual non-calcium images can be used for detection of bone marrow edema. Virtual mono-energetic imaging can be useful for improved iodine conspicuity at lower keV and for reduction of metallic artifacts and increase in signal-to-noise ratio at higher keV.SummaryDECT and its additional reconstructions can play an important role in head and neck cancer patients, from initial diagnosis and staging, to therapy planning, evaluation of treatment response and follow-up. Moreover, it can be helpful in imaging of infections and inflammation and parathyroid imaging as supplementary reconstructions can be obtained at lower or equal radiation dose compared with conventional single energy scanning.

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Assessment of an Advanced Monoenergetic Reconstruction Technique in Dual-Energy Computed Tomography of Head and Neck Cancer

Cited by 128 publications

References 26 publications

Optimizing window settings for improved presentation of virtual monoenergetic images in dual‐energy computed tomography

Optimizing window settings for improved presentation of virtual monoenergetic images in dual‐energy computed tomography

Transcatheter Aortic Valve Replacement

Dual-Energy CT in Head and Neck Imaging

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