Ramsey D. Badawi
University of California, Davis
Imaging phantomOpticsPhysicsRadiologyPET-CTBiomedical engineeringIterative reconstructionArtificial intelligenceMedical physicsImage resolutionPositron emission tomographyScannerNuclear medicineTotal bodyComputer visionMathematicsComputer scienceImage qualityMedicineDetector
178Publications
29H-index
3,113Citations
Publications 172
Newest
#1Yang Zuo (UC Davis: University of California, Davis)H-Index: 5
#2Javier López (UC Davis: University of California, Davis)H-Index: 23
Last. Guobao Wang (UC Davis: University of California, Davis)H-Index: 17
view all 7 authors...
Myocardial blood flow (MBF) and flow reserve are usually quantified in the clinic with positron emission tomography (PET) using a perfusion-specific radiotracer (e.g., 82Rb-chloride). However, the clinical accessibility of existing perfusion tracers remains limited. Meanwhile, 18F-fluorodeoxyglucose (FDG) is a commonly used radiotracer for PET metabolic imaging without similar limitations. In this paper, we explore the potential of 18F-FDG for myocardial perfusion imaging by comparing the myocar...
Source
#1Nicolas Aide (French Institute of Health and Medical Research)H-Index: 28
#2Charline Lasnon (French Institute of Health and Medical Research)H-Index: 12
Last. Daniel R. McGowan (Churchill Hospital)H-Index: 13
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#1Benjamin Spencer (UC Davis: University of California, Davis)H-Index: 5
#2Eric Berg (UC Davis: University of California, Davis)H-Index: 14
Last. Simon R. Cherry (UC Davis: University of California, Davis)H-Index: 93
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The world’s first total-body PET scanner with an axial field-of-view (AFOV) of 194 cm is now in clinical and research use at our institution. The uEXPLORER PET/CT scanner, developed through a collaboration between the University of California, Davis (UC Davis) and United Imaging Healthcare (UIH), is the first commercially available total-body PET scanner. Here we present a detailed physical characterization of the uEXPLORER PET scanner based on NEMA NU-2-2018 along with a new set of measurements...
13 CitationsSource
#1Abhijit J. Chaudhari (UC Davis: University of California, Davis)H-Index: 18
#2Ramsey D. Badawi (UC Davis: University of California, Davis)H-Index: 29
Nuclear medical imaging devices, such as those enabling photon emission imaging (gamma camera, single photon emission computed tomography (SPECT), or positron emission imaging (PET)), that are typically used in today's clinics are optimized for assessing large portions of the human body, and are classified as whole-body imaging systems. These systems have known limitations for organ imaging, therefore application-specific devices have been designed, constructed and evaluated. These devices, give...
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#1Tao FengH-Index: 9
#1Tao FengH-Index: 1
Last. Terry L. Jones (UC Davis: University of California, Davis)H-Index: 30
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Parametric imaging has been shown to provide better quantitation physiologically compared with SUV imaging in PET. With the increased sensitivity from a recently developed total-body PET scanner, whole-body scans with higher temporal resolution become possible for dynamic analysis and parametric imaging. In this paper, we focus on deriving the parameter k1 using compartmental modeling, and on developing a method to acquire whole-body FDG-PET parametric images using only the first 90 seconds of t...
5 CitationsSource
#1Yasser Abdelhafez (UC Davis: University of California, Davis)H-Index: 5
#2Fatma Sen (UC Davis: University of California, Davis)
Last. Lorenzo Nardo (UC Davis: University of California, Davis)H-Index: 29
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1680 Purpose: The 60 min uptake protocol for oncological 18F-FDG PET imaging has been standard of care since the 1990s. The protocol was primarily determined by factors including the sensitivity of the scanners of the era and the necessity of performing transmission scans prior to the injection of radiotracer. Subsequently, post-injection transmission or CT scanning were adopted, delayed imaging has been demonstrated to improve lesion detectability and characterization of findings in a wide rang...
#1Denise Caudle (UC Davis: University of California, Davis)
#2Heather Hunt (UC Davis: University of California, Davis)H-Index: 1
Last. Ofilio Vigil (UC Davis: University of California, Davis)H-Index: 7
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3010 Objectives: Research with imaging as a criterion is difficult to assimilate into clinical workflow of a Molecular Imaging Department lacking a dedicated research imaging center. The Radiology Research Team (RRT) identified a couple of needs regarding research conduct: identification of research specific Nuclear Medicine or PET imaging needs and of research studies into the clinical workflow with minimal disruption. Acknowledging these needs, we created the Radiology Service Request (RSR) fo...
54 null Introduction: null null Total-body dynamic PET can provide tracer kinetic assays of physiologically and biologically relevant information across the entire human body. Our previous work has demonstrated the capability of performing dynamic PET imaging with 100-ms temporal resolution on the uEXPLORER scanner. Sub-second dynamic PET imaging allows clear visualization of fast tracer dynamics after bolus injection with physiological (cardiac and respiratory) motion in real-time. In this work...
#1Mike Nguyen (UC Davis: University of California, Davis)H-Index: 1
#2Kristin McBride (UC Davis: University of California, Davis)H-Index: 1
Last. Ramsey D. Badawi (UC Davis: University of California, Davis)H-Index: 29
view all 15 authors...
3041 Objectives: The ability of positron emission tomography (PET) scanners to accurately reproduce standardized uptake values (SUV) serves as an important imaging biomarker in oncologic studies. We aimed to develop a practical quality control test to verify that an uEXPLORER total-body PET system produces accurate SUVs between and after calibrations and across the 194.0 cm axial field-of-view (AFOV). A 30 cm axial length germanium-68 (Ge-68) cylindrical phantom cross-calibrated with a fluorine-...
#1Kristin McBride (UC Davis: University of California, Davis)H-Index: 1
#2Edwin Leung (UC Davis: University of California, Davis)H-Index: 3
Last. Yasser Abdelhafez (UC Davis: University of California, Davis)H-Index: 5
view all 9 authors...
186 Purpose: Total body PET/CT scanners enable capturing dynamic tracer changes from the entire body simultaneously, however, this task may be challenging from multiple perspectives. We aimed to describe blanching uptake defects seen opposite the bony prominences at the pressure points, which may represent a potential pitfall in dynamic studies performed using high-sensitivity high-resolution total-body scanners. Methods: This is a retrospective review of two prospectively acquired IRB-approved ...