Showing 8 Abstracts.
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
There is a widespread lack of familiarity with the normal appearance of the fetal brain in the early second trimester (12-18 weeks), particularly in MRI. Interpreting these images is challenging because of the continuous fetal motion, small size of structures, and immature appearance of the brain. This educational exhibit aims to increase awareness of the appearance of the fetal brain between 12- and 18-weeks gestation by presenting images of normal fetuses and establishing a correlation with same day ultrasound. All fetuses included in this exhibit were proven to have normal brains on late gestation fetal and/or post-natal brain MRI. After viewing this exhibit the reader will (1) recognize the normal appearance of the brain in the early second trimester, (2) understand the specific developmental trajectories of major structures (ventricles, corpus callosum, etc…), (3) establish a correlation between the sonographic appearance and the fetal MRI. Read More
Meeting name: SPR 2023 Annual Meeting & Postgraduate Course , 2023
Authors: Cortes Albornoz Maria, Calixto Camilo, Bedoya M. Alejandra, Jaimes Camilo
In recent years, 7 Tesla MRI has become a valuable tool in the field of neuroimaging. Ultra-high field strength provides a superior signal-to-noise ratio, which is particularly advantageous for structural and vascular imaging, as well as MR Spectroscopy. Despite the many advantages, artifacts abound at 7T and limit its translation. Furthermore, the high SAR of these scanners and regulatory restrictions imposed by the FDA can limit accessibility for pediatric patients. This educational exhibit aims to delve deeper into these issues and: 1. Review the commercially available hardware. 2. Summarize regulatory and safety constraints. 3. Highlight the advantages of 7T for structural, vascular, and MRS. 4. Illustrate artifacts and limitations. 5. Present examples of brain abnormalities at 7T. References: 1. Opheim G, van der Kolk A, Markenroth Bloch K, Colon AJ, Davis KA, et al. 7T Epilepsy Task Force Consensus Recommendations on the Use of 7T MRI in Clinical Practice. Neurology. 2021 Feb 16;96(7):327-341. doi: 10.1212/WNL.0000000000011413. Epub 2020 Dec 22. PMID: 33361257; PMCID: PMC8055334. Read More
Meeting name: SPR 2024 Annual Meeting & Postgraduate Course , 2024
Authors: Cortes Albornoz Maria, Machado Rivas Fedel, Fazio Ferraciolli Suely, Afacan Onur, Jaimes Camilo
To report the success rate of non-sedate MRI studies in children 1-7 years of age and to evaluate clinical factors predictive of success. Read More
Meeting name: SPR 2020 Annual Meeting & Postgraduate Course , 2020
Authors: Jaimes Camilo, Mahan Kellyn, Machado-rivas Fedel, Bixby Sarah, Robertson Richard
To compare how 3D MRI measurements of physeal cartilage volume, and DTI measurements (tract volume and length) correlate with growth parameters and detect differences in growth between patients treated with cis-retinoic acid and controls. Read More
Meeting name: SPR 2020 Annual Meeting & Postgraduate Course , 2020
Authors: Duong Phuong, Mostoufi-moab Sogol, Raya José, Jaimes Camilo, Delgado Jorge, Jaramillo Diego
Keywords: magnetic resonance imaging, growth plate, short stature
To explore tract-specific developmental changes with deterministic tractography in a population of typically developing fetuses. Read More
Meeting name: SPR 2020 Annual Meeting & Postgraduate Course , 2020
Authors: Jaimes Camilo, Machado-rivas Fedel, Velascoanis Clemente, Khan Shadab, Marami Baram, Gholipour Ali
Keywords: fetal, diffusion, tractography
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