New Prospects for Ultra-High-Field Magnetic Resonance Imaging in Multiple Sclerosis
There is growing interest in imaging multiple sclerosis (MS) through the ultra-high-field (UHF) lens, which currently means a static magnetic field strength of 7 T or higher. Because of higher signal-to-noise ratio and enhanced susceptibility effects, UHF magnetic resonance imaging improves conspicuity of MS pathological hallmarks, among them cortical demyelination and the central vein sign. This could, in turn, improve confidence in MS diagnosis and might also facilitate therapeutic monitoring of MS patients. Furthermore, UHF imaging offers unique insight into iron-related pathology, leptomeningeal inflammation, and spina...
Source: Investigative Radiology - October 14, 2021 Category: Radiology Tags: Specialty Topic Review Articles Source Type: research
Impact of Field Strength in Clinical Cardiac Magnetic Resonance Imaging
Cardiac magnetic resonance imaging (MRI) is widely applied for the noninvasive assessment of cardiac structure and function, and for tissue characterization. For more than 2 decades, 1.5 T has been considered the field strength of choice for cardiac MRI. Although the number of 3-T systems significantly increased in the past 10 years and numerous new developments were made, challenges seem to remain that hamper a widespread clinical use of 3-T MR systems for cardiac applications. As the number of clinical cardiac applications is increasing, with each having their own benefits at both field strengths, no “holy grail” fie...
Source: Investigative Radiology - October 14, 2021 Category: Radiology Tags: Specialty Topic Review Articles Source Type: research
The Value of 3 Tesla Field Strength for Musculoskeletal Magnetic Resonance Imaging
Musculoskeletal magnetic resonance imaging (MRI) is a careful negotiation between spatial, temporal, and contrast resolution, which builds the foundation for diagnostic performance and value. Many aspects of musculoskeletal MRI can improve the image quality and increase the acquisition speed; however, 3.0-T field strength has the highest impact within the current diagnostic range. In addition to the favorable attributes of 3.0-T field strength translating into high temporal, spatial, and contrast resolution, many 3.0-T MRI systems yield additional gains through high-performance gradients systems and radiofrequency pulse tr...
Source: Investigative Radiology - October 14, 2021 Category: Radiology Tags: Specialty Topic Review Articles Source Type: research
Magnetic Resonance Imaging Around Metal at 1.5 Tesla: Techniques From Basic to Advanced and Clinical Impact
During the last decade, metal artifact reduction in magnetic resonance imaging (MRI) has been an area of intensive research and substantial improvement. The demand for an excellent diagnostic MRI scan quality of tissues around metal implants is closely linked to the steadily increasing number of joint arthroplasty (especially knee and hip arthroplasties) and spinal stabilization procedures. Its unmatched soft tissue contrast and cross-sectional nature make MRI a valuable tool in early detection of frequently encountered postoperative complications, such as periprosthetic infection, material wear–induced synovitis, osteol...
Source: Investigative Radiology - October 14, 2021 Category: Radiology Tags: Specialty Topic Review Articles Source Type: research
Low-Field Magnetic Resonance Imaging: A New Generation of Breakthrough Technology in Clinical Imaging
Magnetic resonance imaging (MRI) plays a pivotal role in diagnostic imaging. In today's clinical environment, scanners with field strengths of 1.5 to 3 T are most commonly used. However, recent technological advancements might help to augment the clinical usage and availability of MRI via the introduction of high-performance low-field MRI systems (ranging from ~0.1–0.55 T in current systems). The combination of low field strength and high-performance hardware is characterized by increased flexibility, excellent quality of results, and reduced cost. This review discusses the multifaceted potential advantages of a new gene...
Source: Investigative Radiology - October 14, 2021 Category: Radiology Tags: Specialty Topic Review Articles Source Type: research
7 Tesla and Beyond: Advanced Methods and Clinical Applications in Magnetic Resonance Imaging
Ultrahigh magnetic fields offer significantly higher signal-to-noise ratio, and several magnetic resonance applications additionally benefit from a higher contrast-to-noise ratio, with static magnetic field strengths of B0 ≥ 7 T currently being referred to as ultrahigh fields (UHFs). The advantages of UHF can be used to resolve structures more precisely or to visualize physiological/pathophysiological effects that would be difficult or even impossible to detect at lower field strengths. However, with these advantages also come challenges, such as inhomogeneities applying standard radiofrequency excitation techniques, hig...
Source: Investigative Radiology - October 14, 2021 Category: Radiology Tags: General Review Articles Source Type: research
1.5 vs 3 Tesla Magnetic Resonance Imaging: A Review of Favorite Clinical Applications for Both Field Strengths—Part 2
The second part of this review deals with experiences in neuroradiological and pediatric examinations using modern magnetic resonance imaging systems with 1.5 T and 3 T, with special attention paid to experiences in pediatric cardiac imaging. In addition, whole-body examinations, which are widely used for diagnostic purposes in systemic diseases, are compared with respect to the image quality obtained in different body parts at both field strengths. A systematic overview of the technical differences at 1.5 T and 3 T has been presented in part 1 of this review, as well as several organ-based magnetic resonance imaging appli...
Source: Investigative Radiology - October 14, 2021 Category: Radiology Tags: General Review Articles Source Type: research
1.5 vs 3 Tesla Magnetic Resonance Imaging: A Review of Favorite Clinical Applications for Both Field Strengths—Part 1
Whole-body magnetic resonance imaging (MRI) systems with a field strength of 3 T have been offered by all leading manufacturers for approximately 2 decades and are increasingly used in clinical diagnostics despite higher costs. Technologically, MRI systems operating at 3 T have reached a high standard in recent years, as well as the 1.5-T devices that have been in use for a longer time. For modern MRI systems with 3 T, more complexity is required, especially for the magnet and the radiofrequency (RF) system (with multichannel transmission). Many clinical applications benefit greatly from the higher field strength due to th...
Source: Investigative Radiology - October 14, 2021 Category: Radiology Tags: General Review Articles Source Type: research
Low-Field Magnetic Resonance Imaging: Its History and Renaissance
Low-field magnetic resonance imaging (MRI) systems have seen a renaissance recently due to improvements in technology (both hardware and software). Originally, the performance of low-field MRI systems was rated lower than their actual clinical usefulness, and they were viewed as low-cost but poorly performing systems. However, various applications similar to high-field MRI systems (1.5 T and 3 T) have gradually become possible, culminating with high-performance low-field MRI systems and their adaptations now being proposed that have unique advantages over high-field MRI systems in various aspects. This review article descr...
Source: Investigative Radiology - October 14, 2021 Category: Radiology Tags: General Review Articles Source Type: research
De Novo Radiomics Approach Using Image Augmentation and Features From T1 Mapping to Predict Gleason Scores in Prostate Cancer
Conclusions
When data are limited, image augmentations and features from quantitative T1 mapping sequences might help to achieve higher accuracy and lower generalization error for classification among different Gleason groups in bpMRI by using radiomics. (Source: Investigative Radiology)
Source: Investigative Radiology - September 9, 2021 Category: Radiology Tags: Original Articles Source Type: research
Photon-Counting Computed Tomography for Coronary Stent Imaging: In Vitro Evaluation of 28 Coronary Stents
Objectives
The aim of this study was to assess in-stent lumen visibility and quantitative image characteristics of different coronary stents using a novel photon-counting detector (PCD) computed tomography (CT) system in comparison to a state-of-the-art energy-integrating detector (EID) CT scanner.
Materials and Methods
In this in vitro phantom study, 28 different coronary stents ranging from 2.25 to 4.5 mm lumen diameter were expanded into plastic tubes filled with contrast agent. Stent-containing plastic tubes were positioned in a custom-made emulsion-filled phantom, which was inserted into an anthropomorphic ...
Source: Investigative Radiology - September 9, 2021 Category: Radiology Tags: Original Articles Source Type: research
Development and Evaluation of Deep Learning-Accelerated Single-Breath-Hold Abdominal HASTE at 3 T Using Variable Refocusing Flip Angles
Conclusions
The proposed single-breath-hold abdominal HASTEDL with variable refocusing FAs is feasible at 3 T within SAR limits and yields high image quality and diagnostic confidence as compared with a standard T2-weighted acquisition technique, at a 10th of the acquisition time. (Source: Investigative Radiology)
Source: Investigative Radiology - September 9, 2021 Category: Radiology Tags: Original Articles Source Type: research
Evaluation of Iterative Denoising 3-Dimensional T2-Weighted Turbo Spin Echo for the Diagnosis of Deep Infiltrating Endometriosis
Objectives
The primary end point of this study was to evaluate the image quality and reliability of a highly accelerated 3-dimensional T2 turbo spin echo (3D-T2-TSE) sequence with prototype iterative denoising (ID) reconstruction compared with conventional 2D T2 sequences for the diagnosis of deep infiltrating endometriosis (DIE). The secondary end point was to demonstrate the 3D-T2-TSE sequence image quality improvement using ID reconstruction.
Material and Methods
Patients were prospectively enrolled to our institution for pelvis magnetic resonance imaging because of a suspicion of endometriosis over a 4-month...
Source: Investigative Radiology - September 9, 2021 Category: Radiology Tags: Original Articles Source Type: research
Ultra-High b-Value Diffusion-Weighted Imaging-Based Abbreviated Protocols for Breast Cancer Detection
Conclusions
A native abbreviated breast MRI protocol with advanced high b-value DWI might allow nearly equivalent diagnostic accuracy as CE breast MRI and seems to be well suited for lesion detection purposes. (Source: Investigative Radiology)
Source: Investigative Radiology - September 9, 2021 Category: Radiology Tags: Original Articles Source Type: research
Evaluation of the Diagnostic Performance of Positron Emission Tomography/Magnetic Resonance for the Diagnosis of Liver Metastases
Conclusions
Contrast-enhanced PET/MR has a higher sensitivity and negative predictive value than either PET or MRI alone in the setting of suspected liver metastases. Fewer lesions were characterized as indeterminate by PET/MR in comparison with PET and MRI. This superior performance could potentially impact treatment and management decisions for patients with suspected liver metastases. (Source: Investigative Radiology)
Source: Investigative Radiology - September 9, 2021 Category: Radiology Tags: Original Articles Source Type: research
