Robert C. Orth

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Digital flat-panel detector cone-beam computed tomography (CBCT) has recently been adapted for use with C-arm systems. This configuration provides projection radiography, fluoroscopy, digital subtraction angiography, and volumetric computed tomography (CT) capabilities in a single patient setup, within the interventional suite. Such capabilities allow the(More)
C-arm cone-beam computed tomography (CT) with a flat-panel detector represents the next generation of imaging technology available in the interventional radiology suite and is predicted to be the platform for many of the three-dimensional (3D) roadmapping and navigational tools that will emerge in parallel with its integration. The combination of current(More)
To facilitate consistent, reliable communication among providers, we developed a scoring system (Appy-Score) for reporting limited right lower quadrant ultrasound (US) exams performed for suspected pediatric appendicitis. The purpose of this study was to evaluate implementation of this scoring system and its ability to risk-stratify children with suspected(More)
OBJECTIVE The purpose of this study was to characterize the extent of joint and tendon involvement in patients with juvenile idiopathic arthritis referred for MRI of the wrist or ankle. MATERIALS AND METHODS Forty-five patients (32 female and 13 male patients; mean age, 10 years; age range, 1-19 years) with an established diagnosis of juvenile idiopathic(More)
PURPOSE To prospectively compare nonenhanced magnetic resonance (MR) imaging and ultrasonography (US) for the diagnosis of pediatric appendicitis. MATERIALS AND METHODS This HIPAA-compliant study was approved by the institutional review board, and written informed consent was obtained from the patient's parent or guardian. Eighty-one patients (34 male, 47(More)
Pharmacokinetic parameters corresponding to perfused microvascular volume determined from dynamic contrast-enhanced (DCE) MRI data were compared to immunohistochemical measures of microvascular density (MVD) and perfused microvascular density. DCE MRI data from human mammary tumors (MDA-MB-435) implanted in nude mice using low (Gd-DTPA, MW approximately(More)
OBJECTIVE Previous studies have reported that contrast-enhanced sequences do not increase the sensitivity of MRI for the diagnosis of pediatric osteomyelitis and are not needed in the absence of edema on unenhanced MRI sequences. Invasive skeletal infections due to community-acquired Staphylococcus aureus are increasingly encountered in infants and young(More)
OBJECTIVES Appendicitis is the most common surgical emergency encountered in the pediatric emergency department (ED). We analyzed the time course of children evaluated for suspected appendicitis in relation to implementation of a risk-stratified ultrasound scoring system and structured reporting template (Appy-Score). METHODS In July 2013, a 6-level(More)
Knee pain is a common problem in children and adolescents, and MRI of the knee is the most commonly performed pediatric cross-sectional musculoskeletal imaging exam. The purpose of this pictorial review is to highlight differences between adult and pediatric knee imaging with an emphasis on normal developmental variants, injury and disease patterns unique(More)
BACKGROUND To determine if there is an effective alternative to the current standard of computed tomography (CT) grading of pediatric pancreatic injuries. We hypothesized that the Wong grading scale, which is based on the depth and location of the pancreatic laceration, is more predictive of pseudocyst formation than the American Association for the Surgery(More)