Rofo-fortschritte Auf Dem Gebiet Der Rontgenstrahlen Und Der Bildgebenden Verfahren最新文献

To determine dose-optimized image acquisition parameters for good image quality (IQ) in neonatal chest radiography with a computed radiography (CR) CsBr needle detector vs. a wireless digital radiography (DR) CsI detector using different doses and filters.Physical resolution of the two detectors in unprocessed imaging of a contrast-detail phantom was automatically evaluated. Post-processed chest radiographic imaging of a neonatal phantom was used for Visual Grading Analysis (VGA) by three radiology raters. Different kVp, mAs, and filter settings were used. The VGA score (VGAS) and dose area product (DAP) were used to determine image acquisition parameters and dose levels for good image quality. Pixel data from segments corresponding to visual grading characteristics (VGC) was used to calculate signal-to-noise ratio, contrast-to-noise ratio (CNR), and signal profile curves. These results were compared to the raters' "ground truth" by Spearman's correlation.The CR detector had the highest resolution in unprocessed imaging, although this was dependent on a tube voltage of 66 kVp (P < 0.001), and more so than the DR detector. The VGAS showed no significant difference between the CR needle and the DR CsI detectors at the same DAP, or when using standard pediatric filtering of 3.5 mm Al + 0.1 mm Cu (P > 0.05). A lung dose level of 0.017 mSv was needed for good IQ (effective dose (E): 0.010 mSv). This was achievable with different acquisition parameters. Out of 24 segments, only the CNR of bone-to-soft-tissue had a good Spearman's correlation (ρ > 0.50) to raters' VGAS (P < 0.0001), mostly due to problems with image registration.The CR needle and DR CsI detectors have comparable IQ in neonatal chest radiography. In this study, an E of approximately 0.010 mSv was needed for good IQ. · CR needle and DR detectors have comparable image quality in neonatal chest radiography.. · CR needle technology has higher absolute raw image resolution, although this is voltage-dependent and more so than the DR detector.. · We propose ideal image acquisition parameters for neonatal chest radiography.. · Rama K, Esser M, Spogis J et al. Dose-Optimized Image Acquisition Parameters for Neonatal Chest Radiography: A Phantom Study Comparing Computed Radiography and Wireless Digital Radiography Needle Detectors. Rofo 2025; DOI 10.1055/a-2525-9430.

Wrist pain is common and can be attributed to tendon pathologies.This review aims to give a structured review of tendon anatomy, discuss anatomical pitfalls, and provide an overview of typical tendon pathologies of the wrist based on the current literature.Typical tendon pathologies of the wrist include de Quervain tenosynovitis, proximal and distal intersection syndrome, extensor and flexor pollicis longus tendon ruptures, and extensor carpi ulnaris subsheath injury. Typical pitfalls are multiple bundles of the abductor pollicis longus tendon or the centrally increased signal of the extensor carpi ulnaris tendon.Both ultrasound and MRI are appropriate modalities for assessing the tendons of the wrist. Knowledge of normal anatomy, variants, pathologies, as well as appropriate imaging is crucial to determine the diagnosis. · Multiple tendon bundles of the abductor pollicis longus are a common anatomical feature and should not be mistaken for tendon splitting.. · An anatomical pitfall resembles the frequently found centrally increased signal of the extensor carpi ulnaris tendon caused by fibrovascular tissue.. · In order to visualize the diagnosis of a proximal intersection syndrome, the MR scan field needs to include the area approximately 4 to 8 cm proximal to Lister's tubercle.. · The tendons of the thumb, i.e., extensor and flexor pollicis longus, are most commonly torn after distal radial fracture (EPL) and osseous hardware fixation (FPL).. · Marth T, Grob NA, Jacobson JA et al. Tendon Anatomy and Tendon Disorders of the Wrist. Rofo 2025; DOI 10.1055/a-2499-5875.

There has been a significant increase in the number of spinal surgical procedures performed over the last few decades, resulting in a proportionate increase in the number of postoperative imaging studies.An exhaustive literature search was performed along with consideration of various guidelines and expert opinions regarding postoperative spine imaging. Complications are divided into early (in the first few weeks) and delayed, depending on the time of onset. Some complications occurring in the early postoperative period are common for both the instrumented and non-instrumented spine. Delayed complications are specific to the type of surgery performed and have been described as such. This review discusses the normal postoperative appearance and the various early and delayed complications.An understanding of the normal postoperative appearance is pertinent to distinguish normal from abnormal. A plain radiograph is the primary imaging modality for immediate postoperative assessment and long-term follow-up after spinal instrumentation. MRI with or without contrast is the imaging modality of choice for the evaluation of the postoperative spine. CT is the best modality for the assessment of the instrumented spine and status of bony fusion. Imaging assessment of the postoperative spine is complex and requires knowledge of key factors for interpretation like indications for the initial surgical procedure, type and approach of the surgical procedure, instrumentation used, time elapsed since surgery, and clinical complaints. · For proper interpretation of the postoperative spine, it is very important to understand the indication and type of spinal procedure involved. · Baseline postoperative radiographs are important to detect any change in the position of metalwork and implant integration.. · Computed tomography is the modality of choice to evaluate bony fusion and metalwork-specific complications. · Postoperative fluid collection is the most common early complication and MRI is the imaging modality of choice for the identification of the same.. · Intravenous gadolinium is helpful to differentiate between scar/vascularized granulation tissue and recurrent or residual disc.. · Kaur S, Lalam R, Trivedi R. Imaging of the postoperative spine. Rofo 2025; DOI 10.1055/a-2507-8347.

To explore the peak enhancement time of a hepatocellular carcinoma, the pancreas, and the kidney cortex and its determinants.We obtained a time enhancement curve from the perfusion CT scans of 11 advanced HCC patients (40 volumes at 1.25 s time interval, slab slice 90 mm, bolus of 50 ml of iodinated contrast agent, 350 g iodine/ml, flow 5 ml/s). Small regions of interest were drawn on the abdominal aorta, the HCC, the cortex of the right kidney, and on the pancreas. The behavior of the contrast agent in the capillary and in the surrounding tissue was further explored with a finite element model.The peak enhancement time of the pancreas did not differ from that of the HCC (10±3 vs. 11±4 s, p=0.9), while the peak enhancement time of the kidney tended to be a few seconds earlier (8±1 s, p=0.082 vs. pancreas and p=0.069 vs. kidney). Simulation showed that the time span in which the tissue enhancement remained within 10% of its peak value was similar across all capillary densities and ranged between 26-38 s for a capillary density of 0.00125 per mm to 30-60 s for a capillary density of 0.01.The plateau tissue enhancement clinically acquired in the "late arterial phase" should be adequate both for the detection of hypervascular liver lesions such as HCCs and for obtaining peak pancreatic enhancement to detect hypovascular lesions. · The peak tissue enhancement time of an HCC, the pancreas, and the kidney cortex is similar. · The tissue peak enhancement time in the arterial phase is at the end of bolus transit. · Simulation shows that tissue enhancement peak time is a function of capillary density. · Cressoni M, Cadringher P, Colarieti A et al. Is there a need for a CT scan of the pancreatic phase? A perfusion and simulation study of the pancreas, an HCC, and the kidney cortex. Rofo 2025; DOI 10.1055/a-2516-3176.

The aim of our study was to assess the attitudes towards AI and teleradiology and their current usage in pediatric radiology within German-speaking countries.From March to May 2023, we conducted an anonymous online survey among members of the Society for German-speaking Pediatric Radiologists (GPR) and the Swiss Society for Pediatric Radiology (SGPR) via the SurveyMonkey platform. The survey consisted of 25 items with rating scales and open-ended responses.Out of 418 society members, 36 completed the questionnaire (8.6%). Teleradiology (50% fully agree, 27.8% partly agree) and AI (38.9% fully agree, 22.2% partly agree) were considered relevant for pediatric radiology by the majority of respondents. Teleconsultation for second opinions is regularly used in 58% of the departments. Currently, AI does not play a significant role in the daily work of 52.8% of respondents. Beyond segmentation, AI is used primarily for image acquisition and dose reduction. Over 80% of respondents indicated that bone age determination is well-suited for an AI solution, yet only 31% routinely use such a solution.AI and teleradiology have a high level of acceptance in German-speaking pediatric radiology (Germany, Austria, Switzerland, i.e. the DACH region) and are seen as a possible strategy for improving pediatric radiology care. This contrasts with the current low level of use in clinical routine. · Pediatric radiologists in the DACH region consider AI and teleradiology to be important for pediatric radiology care.. · AI/teleradiology are seen as viable options to enhance pediatric radiology care.. · However, the actual use of AI/teleradiology in everyday routine is low.. · Sturm M, von Kalle T, Renz DM et al. Artificial Intelligence and Teleradiology in Pediatric Radiology: A Survey by the Society for German-speaking Pediatric Radiologists (GPR) and the Swiss Society for Pediatric Radiology (SGPR). Rofo 2025; DOI 10.1055/a-2516-3057.