Showing 9 Abstracts.
Whole-body magnetic resonance imaging (WB-MRI) is an increasingly important tool in pediatric oncology. Optimized WB-MRI protocols allow for abbreviated imaging of young patients with excellent tissue contrast/resolution and without ionizing radiation exposure. Recent data suggest a role for WB-MRI in pediatric cancer staging, cancer predisposition syndrome (CPS) surveillance and evaluation for chemotherapy-related osteonecrosis. The purpose of this study is to evaluate the performance of WB-MRI in these populations. Read More
Meeting name: SPR 2018 Annual Meeting & Postgraduate Course , 2018
Authors: Hampilos Perry, Friedmann Alison, Gee Michael
Keywords: MRI, Oncology, Osteonecrosis
Fetal MRI has transformed prenatal patient care, allowing for earlier and better detection of complex congenital anomalies. However, fetal MRI’s diagnostic utility is often limited by technical barriers that introduce artifacts and reduce image quality. The main determinants of fetal MRI image quality are speed of acquisition, spatial resolution and SNR. Optimization of imaging is a challenge because improvements in one aspect generally leads to a tradeoff in the others. Moreover, the recent introduction of 3T fetal MRI to achieve better SNR adds to the complexity. Motion, banding artifacts, and aliasing artifacts impact the quality of fetal acquisitions at any field strength. High SAR and artifacts from inhomogeneities in the RF field are important limitations of high field strength imaging. Fetal and maternal motion create the need for rapid image acquisition. This generally limits imaging to SST2w, bSSFP, T1w spoiled-GRE, and EPI sequences. Acquisitions can be degraded by low SNR, resulting in grainy images. This can be improved by increasing the number of coil elements or increasing the field strength. Blurry images can be a result of low resolution and can be improved by decreasing the FOV (at expense of SNR) or increasing the field strength. Most strategies to improve quality will also increase SAR, which can be controlled by decreasing the number of slices, lowering the excitation or refocusing flip angles, increasing the TR or lowering the field strength. Fast sequences can prevent some motion artifacts, other strategies include decreasing the number of slices, swapping the PE and FE directions, maternal breath hold or oral sedatives, and image reconstruction by motion correction algorithms. Aliasing artifacts can be effectively addressed by phase-oversampling (at expense of SAR in SST2w sequences) or rotating the long axis of the PE direction. Banding artifacts of bSSFP sequences can be minimized by decreasing TR (at expense of SAR) or lowering field strength. High field strength imaging can be severely limited by shading secondary to RF field inhomogeneities. Multichannel field transmit and complex field strength shaping show promising results to address this issue. In this educational exhibit we will use visual examples to discuss: 1) fetal MRI quality optimization tradeoffs, 2) technical barriers and artifacts that impact image quality, and 3) solutions to improve quality and reduce artifacts. Read More
Meeting name: SPR 2020 Annual Meeting & Postgraduate Course , 2020
Authors: Machado-rivas Fedel, Jaimes Camilo, Kirsch John E, Gee Michael
Keywords: Prenatal
To review up-to-date imaging techniques, normal sonographic anatomy, and characteristic sonographic features of disorders affecting the gastrointestinal tract in children. Read More
Meeting name: IPR 2016 Conjoint Meeting & Exhibition , 2016
Authors: Gale Heather, Gee Michael, Westra Sjirk, Lee Edward, Nimkin Katherine
Keywords: Gastrointestinal, Ultrasound
To evaluate the sociodemographic and exam-related characteristics associated with child life specialist intervention (CLSI) success or failure in acquiring non-sedated pediatric MRI Read More
Meeting name: SPR 2023 Annual Meeting & Postgraduate Course , 2023
Authors: Pena Trujillo Valeria, Gallo-bernal Sebastian, Weagle Kathryn, Victoria Teresa, Gee Michael
Keywords: Child Life Specialist, MRI, Non-sedated
Pectus excavatum (PEx) is a chest wall deformity that leads to sternal depression and can impair cardiopulmonary function. CT imaging is used for surgical planning but exposes children to a significant radiation dose. Ultra-low dose CT enables PEx assessment in children with radiation exposure comparable to plain radiographs. The purpose of this study is to evaluate image quality and detection of thoracic pathology on ultra-low dose CT in children with PEx. Read More
Meeting name: SPR 2020 Annual Meeting & Postgraduate Course , 2020
Authors: Kim Jesi, Nimkin Katherine, Westra Sjirk, Gee Michael, Stockton Katherine, Savage Cristy
Keywords: Pectus excavatum, ultra-low dose, pediatrics
Scanner console-provided volume CT Dose Index (CTDIvol) and Dose Length Product (DLP) are frequently added up inappropriately to obtain cumulative dose values in patients exposed to multiple multi-sequence CT exams, performed with varying z-axis coverage and often with longitudinal tube current modulation. We present the patient-size specific Dose Line Integral (DLI) as a new metric that allows this task to be performed in a more precise fashion across multiple scanner platforms Read More
Meeting name: SPR 2020 Annual Meeting & Postgraduate Course , 2020
Authors: Tabari Azadeh, Li Xinhua, Yang Kai, Liu Bob, Gee Michael, Westra Sjirk
There is little data describing imaging sedation and anesthesia practice patterns in pediatric radiology. The purpose of this study was to understand current imaging sedation and anesthesia practice patterns based on a survey of member institutions of the Society of Chairs of Radiology at Children’s Hospitals (SCORCH) in conjunction with the American College of Radiology’s Pediatric Imaging Sedation and Anesthesia Committee. Read More
Meeting name: SPR 2020 Annual Meeting & Postgraduate Course , 2020
Authors: Dillman Jonathan, Gee Michael, Ward Christopher, Drum Elizabeth, Servaes Sabah, Jaimes Camilo, States Lisa
Keywords: Imaging, Anesthesia, Sedation
The use of feed and swaddle (FS) technique in infants has increased in popularity due to the concern for neurotoxicity from medications used for anesthesia or sedation. The purpose for evaluating the age group < 6 months of age was to understand current imaging sedation and anesthesia practice patterns based on a survey of member institutions of the Society of Chairs of Radiology at Children’s Hospitals (SCORCH) in conjunction with the American College of Radiology’s Pediatric Imaging Sedation and Anesthesia Committee. Read More
Meeting name: SPR 2020 Annual Meeting & Postgraduate Course , 2020
Authors: States Lisa, Gee Michael, Servaes Sabah, Jaimes Camilo, Ward Christopher, Drum Elizabeth, Dillman Jonathan
Keywords: Feed and Swaddle, sedation, anesthesia
MR elastography (MRE) is increasingly being used to non-invasively assess diffuse liver disease in children. However, there are limited normal liver stiffness data for MRE in children. The purpose of this study was to determine normal liver stiffness measured by MRE for children and assess for associations with demographic factors, MRI field strength and MRI vendor. Read More
Meeting name: SPR 2020 Annual Meeting & Postgraduate Course , 2020
Authors: Trout Andrew, Zhang Bin, Dillman Jonathan, Anupindi Sudha, Gee Michael, Khanna Geetika, Xanthakos Stavra, Baikpour Masoud, Calle-toro Juan, Ozturk Arinc, Serai Suraj
Keywords: Elastography, MR, Liver