Rapid switching kVp dual energy CT: Value of reconstructed dual energy CT images and organ dose assessment in multiphasic liver CT exams

Mahmood, Usman; Horvat, Natally; Horvat, João V.; Ryan, Davinia; Gao, Yiming; Carollo, Gabriella; DeOcampo, Rommel; Richard, K. G.; Katz, Seth; Gerst, Scott R.; Schmidtlein, C. Ross; Dauer, Lawrence T.; Erdi, Yusuf E.; Mannelli, Lorenzo

doi:10.1016/j.ejrad.2018.02.022

Cited by 21 publications

(14 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, VUE images have been demonstrated to have lower image noise when compared to true enhanced images, and, especially in smaller patients, rapid switching DECT showed lower radiation dose when compared to single-energy CT scans, even if misconceptions about the radiation dose from 2 simultaneous X-ray projections and questions regarding the accuracy of additional DECT reconstructions have limited the widespread clinical implementation of this technology. 21 As far as DSCT is concerned, the most widespread dosesaving protocols (retrospective acquisition with ECG-gated tube current modulation, SAS mode, and FLASH mode) carry advantages and drawbacks.…”

Section: Discussionmentioning

confidence: 99%

Image Quality and Dose Reduction by Dual Source Computed Tomography Coronary Angiography: Protocol Comparison

et al. 2018

View full text Add to dashboard Cite

Purpose:To compare image quality and radiation dose among different protocols in patients who underwent a 128-slice dual source computed tomography coronary angiography (DSCT-CTCA).Methods:Ninety patients were retrospectively grouped according to heart rate (HR): 26 patients (group A) with stable HR ≤60 bpm were acquired using high pitch spiral mode (FLASH); 48 patients (group B) with irregular HR ≤60 bpm or stable HR between 60 and 70 bpm using step and shoot mode; and 16 patients (group C) with irregular HR >60 bpm or stable HR ≥70 bpm by retrospective electrocardiogram pulsing acquisition. Signal to noise ratio (SNR) and contrast to noise ratio (CNR) were measured for the main vascular structures. Moreover, the dose-length product and the effective dose were assessed.Results:Both SNR and CNR were higher in group A compared to group C (18.27 ± 0.32 vs 11.22 ± 0.50 and 16.75 ± 0.32 vs 10.17 ± 0.50; P = .001). The effective dose was lower in groups A and B (2.09 ± 1.27 mSv and 4.60 ± 2.78 mSv, respectively) compared to group C (9.61 ± 5.95 mSv) P < .0001.Conclusion:The correct selection of a low-dose, HR-matched CTCA scan protocol with a DSCT scanner provides substantial reduction of radiation exposure and better SNR and CNR.

show abstract

Section: Discussionmentioning

confidence: 99%

Image Quality and Dose Reduction by Dual Source Computed Tomography Coronary Angiography: Protocol Comparison

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Similarly, material suppressed images (iodine subtraction) are not available for the GE image acquisitions. GE's AW server can generate several types of synthetic maps (i.e., material suppressed images) and other material density combinations, which has been utilized in other works 23,24 . However, that feature is not included in the clinical work‐flow tool, and thus requires manual processing which is impractical for a routine automated QC program.…”

Section: Methodsmentioning

confidence: 99%

Design and implementation of a practical quality control program for dual‐energy CT

Green

Solomon

Ruchala

et al. 2021

J Applied Clin Med Phys

View full text Add to dashboard Cite

A novel routine dual-energy computed tomography (DECT) quality control (QC) program was developed to address the current deficiency of routine QC for this technology. The dual-energy quality control (DEQC) program features (1) a practical phantom with clinically relevant materials and concentrations,(2) a clinically relevant acquisition, reconstruction, and postprocessing protocol, and (3) a fully automated analysis software to extract quantitative data for database storage and trend analysis. The phantom, designed for easy set up for standalone or adjacent imaging next to the ACR phantom, was made in collaboration with an industry partner and informed by clinical needs to have four iodine inserts (0.5,1, 2, and 5 mg/ml) and one calcium insert (100 mg/ml) equally spaced in a cylindrical water-equivalent background. The imaging protocol was based on a clinical DECT abdominal protocol capable of producing material specific concentration maps, virtual unenhanced images, and virtual monochromatic images. The QC automated analysis software uses open-source technologies which integrates well with our current automated CT QC database. The QC program was tested on a GE 750 HD scanner and two Siemens SOMATOM FLASH scanners over a 3-month period. The automated algorithm correctly identified the appropriate region of interest (ROI) locations and stores measured values in a database for monitoring and trend analysis. Slight variations in protocol settings were noted based on manufacturer.Overall,the project proved to provide a convenient and dependable clinical tool for routine oversight of DE CT imaging within the clinic.

show abstract

“…Conventionally available methods include MR spectroscopy (MRS), the dual-echo MRI method, CT measurements, and visual evaluation via ultrasonic tests. Among these, MRS (magnetic resonance spectroscopy) has yielded the highest fat content [ 35 ]. Conversely, new quantitative methods have been developed for ultrasound tests, MRI, and CT.…”

Section: Evaluation Of Hepatic Steatosis Using Dectmentioning

confidence: 99%

Dual-Energy Computed Tomography of the Liver: Uses in Clinical Practices and Applications

et al. 2021

View full text Add to dashboard Cite

Dual-energy computed tomography (DECT) is an imaging technique based on data acquisition at two different energy settings. Recent advances in CT have allowed data acquisitions and simultaneous analyses of X-rays at two energy levels, and have resulted in novel developments in the field of abdominal imaging. The use of low and high X-ray tube voltages in DECT provide fused images that improve the detection of liver tumors owing to the higher contrast-to-noise ratio (CNR) of the tumor compared with the liver. The use of contrast agents in CT scanning improves image quality by enhancing the CNR and signal-to-noise ratio while reducing beam-hardening artifacts. DECT can improve detection and characterization of hepatic abnormalities, including mass lesions. The technique can also be used for the diagnosis of steatosis and iron overload. This article reviews and illustrates the different applications of DECT in liver imaging.

show abstract

Rapid switching kVp dual energy CT: Value of reconstructed dual energy CT images and organ dose assessment in multiphasic liver CT exams

Cited by 21 publications

References 30 publications

Image Quality and Dose Reduction by Dual Source Computed Tomography Coronary Angiography: Protocol Comparison

Image Quality and Dose Reduction by Dual Source Computed Tomography Coronary Angiography: Protocol Comparison

Design and implementation of a practical quality control program for dual‐energy CT

Dual-Energy Computed Tomography of the Liver: Uses in Clinical Practices and Applications

Contact Info

Product

Resources

About