Dilbar Abdurakhimova
Mayo Clinic
Imaging phantomLumen (unit)OpticsPhysicsFigure of meritBiomedical engineeringIterative reconstructionPerfusionPixelNoise reductionDeconvolutionOptical transfer functionEnergy (signal processing)Hounsfield scaleMaterials scienceImage resolutionArteryVasa vasorumIodinated contrastScannerUric acidPhoton countingAcquisition ProtocolCALCIUM OXALATE MONOHYDRATEArea under the roc curveNuclear medicineCt numberImage typeDual energyRenal stoneIsotropic resolutionHigh resolution imagingPhoton counting detectorIodineImage qualityPoint spread functionMedicineObserver (quantum physics)Detector
6Publications
3H-index
20Citations
Publications 6
Newest
#1Wei Zhou (Mayo Clinic)H-Index: 13
#2Dilbar Abdurakhimova (Mayo Clinic)H-Index: 3
Last. Shuai Leng (Mayo Clinic)H-Index: 53
view all 6 authors...
The purpose of this study is to determine the optimal iodine contrast-to-noise ratio (CNR) achievable for different patient sizes using virtual-monoenergetic-images (VMIs) and a universal acquisition protocol on photon-counting-detector CT (PCD-CT), and to compare results to those from single-energy (SE) and dualsource- dual-energy (DSDE) CT. Vials containing 3 concentrations of iodine were placed in torso-shaped water phantoms of 5 sizes and scanned on a 2nd generation DSDE scanner with both SE...
6 CitationsSource
#1Wei Zhou (Mayo Clinic)H-Index: 13
#2Rachel Schornak (Mayo Clinic)H-Index: 1
Last. Shuai Leng (Mayo Clinic)H-Index: 53
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Photon counting detector (PCD) based multi-energy CT is able to generate different types of images such as virtual monoenergetic images (VMIs) and material specific images (e.g., iodine maps) in addition to the conventional single energy images. The purpose of this study is to determine the image type that has optimal iodine detection and to determine the lowest detectable iodine concentration using a PCD-CT system. A 35 cm body phantom with iodine inserts of 4 concentrations and 2 sizes was sca...
5 CitationsSource
#1Kishore Rajendran (Mayo Clinic)H-Index: 11
#2Shengzhen Tao (Mayo Clinic)H-Index: 13
Last. Cynthia H. McCollough (Mayo Clinic)H-Index: 76
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Photon-counting detector based CT (PCD-CT) enables dose efficient high resolution imaging, in addition to providing multi-energy information. This allows better delineation of anatomical structures crucial for several clinical applications ranging from temporal bone imaging to pulmonary nodule visualization. Due to the smaller detector pixel sizes required for high resolution imaging, the PCD-CT images suffer from higher noise levels. The image quality is further degraded in narrow energy bins a...
5 CitationsSource
#1Kishore Rajendran (Mayo Clinic)H-Index: 11
#2Shuai Leng (Mayo Clinic)H-Index: 53
Last. Cynthia H. McCollough (Mayo Clinic)H-Index: 76
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Changes in arterial wall perfusion mark the onset of atherosclerosis. A characteristic change is the increased spatial density of vasa vasorum (VV), the microvessels in the arterial walls. Measuring this increased VV (IVV) density using contrast-enhanced computed tomography (CT) has had limited success due to blooming effects from contrast media. If the system point-spread function (PSF) is known, then the blooming effect can be modeled as a convolution between the true signal and the PSF. We re...
4 CitationsSource
#1Andrea Ferrero (Mayo Clinic)H-Index: 8
#2Ralf Gutjahr (TUM: Technische Universität München)H-Index: 7
Last. Cynthia H. McCollough (Mayo Clinic)H-Index: 76
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In addition to the standard-resolution (SR) acquisition mode, a high-resolution (HR) mode is available on a research photon-counting-detector (PCD) whole-body CT system. In the HR mode each detector consists of a 2x2 array of 0.225 mm x 0.225 mm subpixel elements. This is in contrast to the SR mode that consists of a 4x4 array of the same subelements, and results in 0.25 mm isotropic resolution at iso-center for the HR mode. In this study, we quantified ex vivo the capabilities of the HR mode to...
4 CitationsSource
#1Kishore Rajendran (Mayo Clinic)H-Index: 11
#2Shuai Leng (Mayo Clinic)H-Index: 53
Last. Cynthia H. McCollough (Mayo Clinic)H-Index: 76
view all 6 authors...
Changes in arterial wall perfusion are an indicator of early atherosclerosis. This is characterized by an increased spatial density of vasa vasorum (VV), the micro-vessels that supply oxygen and nutrients to the arterial wall. Detection of increased VV during contrast-enhanced computed tomography (CT) imaging is limited due to contamination from blooming effect from the contrast-enhanced lumen. We report the application of an image deconvolution technique using a measured system point-spread fun...
2 CitationsSource