Dual energy CTA of the supraaortic arteries: Technical improvements with a novel dual source CT system

Lell, Michael; Hinkmann, Fabian; Nkenke, Emeka; Schmidt, Bernhard; Seidensticker, Peter; Kalender, Willi A.; Uder, Michael; Achenbach, Stephan

doi:10.1016/j.ejrad.2009.09.022

Cited by 24 publications

(11 citation statements)

References 24 publications

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“…3,4,[14][15][16][17][18][19][20] The results presented here confirm the findings of recent studies 4,5 that demonstrated that iodine could be effectively subtracted from a DECT angiogram to yield a virtual noncontrast image that rivaled traditional NCCT in its diagnostic utility for hemorrhage detection. Our study expands on these findings by demonstrating the ability of DECT to classify regions where iodine and hemorrhage may both be present.…”

Section: Discussionsupporting

confidence: 79%

Differentiation of Hemorrhage from Iodinated Contrast in Different Intracranial Compartments Using Dual-Energy Head CT

Phan

Yoo²,

Hirsch³

et al. 2012

AJNR Am J Neuroradiol

179

116

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BACKGROUND AND PURPOSE:Identification of ICH, particularly after ischemic stroke therapy, is important for guiding subsequent antithrombotic management and is often confounded by contrast staining or extravasations within intracerebral or extra-axial compartments. This study evaluates the accuracy of DECT in distinguishing ICH from iodinated contrast in patients who received contrast via IA or IV delivery.

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Section: Discussionsupporting

confidence: 79%

Differentiation of Hemorrhage from Iodinated Contrast in Different Intracranial Compartments Using Dual-Energy Head CT

Phan

Yoo²,

Hirsch³

et al. 2012

AJNR Am J Neuroradiol

179

116

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“…In addition, the use of virtual non-contrast images has been reported for the diagnosis of a lipiodol embolism after hepatocellular carcinoma chemoembolization (25). Several articles have compared dualenergy bone removal to automatic bone removal and digital subtraction CTA, and the dual-energy technique was found to be superior to both techniques, particularly at the level of the skull base (26)(27)(28)(29)(30)(31)(32)(33)(34)(35). In addition, the radiation dose was reduced as compared to digital subtraction CTA (26,27,31).…”

Section: Neuroradiological Applicationsmentioning

confidence: 99%

“…They also allow the removal of bone and calcium from the carotid and brain CTA (23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36).…”

Section: Neuroradiological Applicationsmentioning

confidence: 99%

Dual-energy CT revisited by multidetector ct: review of principles and clinical applications

Karçaaltıncaba

Aktaş²

2010

Diagn Interv Radiol

152

127

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A lthough dual-energy CT (DECT) was first conceived in 1976, it has not been used widely for clinical indications (1-11). Recently, the simultaneous acquisition of dual-energy data has been introduced using multidetector CT (MDCT) with two X-ray tubes and rapid peak kilovoltage (kVp) switching (gemstone spectral imaging, GSI) (12-16). Two major advantages of DECT are material decomposition by the almost simultaneous acquisition of two image series with different kVp (80 and 140 kVp) and the elimination of misregistration artifacts. In general, noncontrast (unenhanced) images can be avoided by using the dual-energy mode for body and neurological applications; iodine can be removed from the image, and a virtual non-contrast (water) image can be acquired. The major advantage of 80-kVp compared to 140-kVp images is a higher image contrast (Fig. 1). Hounsfield unit measurements on DECT are not absolute and can change depending on the kVp used for the acquisition (at different keV). Typically, a combination of 80/140 kVp is used for DECT, but for some applications, 100/140 kVp is preferred. In this study, we summarized the clinical applications of DECT in the brain, chest and abdomen and in the cardiovascular and musculoskeletal systems (Table 1). Technique and principlesThe basic principle of dual-energy is the acquisition of 2 datasets from the same anatomic location with different kVp (usually 80 and 140 kVp) (1,2,17,18). In the early days of CT, consecutive single-slice acquisitions with different kVp were performed as a dual-energy technique, but this method suffered from breathing and partial volume artifacts (1, 2). At present, an entire body can be scanned within seconds using the DECT technique, and thus, misregistration artifacts due to breathing are eliminated.Currently, three systems are capable of the nearly simultaneous acquisition of dual-energy data during a single breath hold (12, 14, 15): 64-slice dual-source CT (Definition, Siemens Medical Systems; Erlangen, Germany), 128-slice dual-source CT (Definition Flash, Siemens Medical Systems) and high-definition 64-MDCT (Discovery 750 HD, GE Healthcare; Milwaukee, Wisconsin, USA). In the two systems available from Siemens, the two tubes (tubes A and B) use different kVp (80 and 140 kVp), and in 64-MDCT, the kVp switches from 80 to 140 kVp in less than 0.5 ms. In dual systems, there is concern regarding the susceptibility of the system to cardiac motion due to the time difference (75 or 83 ms) between the tube A and tube B acquisitions of the dual-energy data, but the dual-source CT and 64-MDCT have not been compared to evaluate this issue. The technical specifications of the DECT systems are summarized in Table 2.The images presented in this article were acquired using a 64-slice dual source CT (Definition, Siemens Medical Systems) and a 64-MDCT (Discovery 750HD, GE Healthcare). The DECT data acquired by both systems can be evaluated with a dedicated workstation using dual-energy software that ABSTRACT Although dual-energy CT (DECT) was first conceived in ...

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“…The excellent bone removal capacities of DEBR have so far not been reported for the delineation of EC/IC-bypass but corresponding results have been reported for the supraaortic vessels by Morhard et al [23], Lell et al [24], Thomas et al [25] and Deng et al [26]. The visualization of the cranial vasculature comparing DEBR-CTA with the gold standard DSA [27] has only been presented in a study by Watanabe et al [28] presenting the findings of 12 patients with carotid stenosis and/or cerebral aneurysms.…”

Section: Discussionmentioning

confidence: 74%

Dual energy bone subtraction in computed tomography angiography of extracranial-intracranial bypass: feasibility and limitations

et al. 2010

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Dual energy CTA of the supraaortic arteries: Technical improvements with a novel dual source CT system

Cited by 24 publications

References 24 publications

Differentiation of Hemorrhage from Iodinated Contrast in Different Intracranial Compartments Using Dual-Energy Head CT

Differentiation of Hemorrhage from Iodinated Contrast in Different Intracranial Compartments Using Dual-Energy Head CT

Dual-energy CT revisited by multidetector ct: review of principles and clinical applications

Dual energy bone subtraction in computed tomography angiography of extracranial-intracranial bypass: feasibility and limitations

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