Quantitative tissue classification using dual-energy CT has the potential to improve accuracy in radiation therapy dose planning as it provides more information about material composition of scanned objects than the currently used methods based on single-energy CT. One problem that hinders successful application of both singleand dualenergy CT is the presence of beam hardening and scatter artif...

Dualor multi-energy computed tomography systems that can provide improved material identification are of great interest in airport luggage screening. While dual-energy luggage scanning systems are commercially available, dual-energy reconstruction remains challenging because data sensitivity varies greatly depending on the material parameter being estimated, and because prior information about ...

Renal colic is a common presentation, with patients complaining of moderate to severe flank pain with or without hematuria. Unenhanced low-dose multidetector CT (MDCT) is recognized as the most accurate examination technique. It shows the precise location and size of renal stones within the kidney, the ureters, and the bladder. If the MDCT examination shows a ureteral stone <5 mm, the stone wil...

PURPOSE To evaluate the clinical utility of dual energy spectral CT (DEsCT) in staging and characterizing gastric cancers. MATERIALS AND METHODS 96 patients suspected of gastric cancers underwent dual-phasic scans (arterial phase (AP) and portal venous phase (PP)) with DEsCT mode. Three types of images were reconstructed for analysis: conventional polychromatic images, material-decomposition ...

In this paper we present a structure-preserving dual-energy (SPDE) CT reconstruction method for security, which provides enhanced estimates of material-dependent basis coefficient images. In security applications many different materials may be scanned in various degrees of clutter and metal objects are common. Image noise and metal artifacts are often severe and can lower the accuracy of mater...

The purpose of this work is to investigate the use of dual-energy micro-computed tomography (CT) for the estimation of vascular, tissue, and air fractions in rodent lungs using a postreconstruction three material decomposition method. Using simulations, we have estimated the accuracy limits of the decomposition for realistic micro-CT noise levels. Next, we performed experiments involving ex viv...

PURPOSE To evaluate the diagnostic performance of dual energy (DE) perfusion-CT for the differentiation between postoperative soft-tissue formation and tumor recurrence in patients after potentially curative pancreatic cancer resection. MATERIAL AND METHODS 24 patients with postoperative soft-tissue formation in the conventional regular follow-up CT acquisition after pancreatic cancer resecti...

I read with interest the article by Özdeniz et al. (1), on dual-source dual-energy computed tomography (DECT) to differentiate fecal matter from neoplasm. The study was well done and was based on density measurements in iodine maps and virtual unenhanced images. I would like to add a few points to the discussion. The main advantage of DECT is material decomposition and the relative iodine conce...

X-ray computed tomography (CT) images obtained with a polychromatic X-ray source were simulated by computer for homogeneous solutions and suspensions containing a heavy element. When the K-edge of the element was near the peak energy of the polychromatic X-ray spectrum, the degree of beam hardening in the simulated CT image strongly depended on the atomic number and molar concentration of the ...