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; 197: 1416-1425.

Interventional therapies for hepatocellular carcinoma (HCC) include various methods such as transarterial chemoembolization (TACE), radiofrequency and microwave ablation (RFA, MWA), selective internal radiotherapy (SIRT), and stereotactic body radiation therapy (SBRT). Imaging follow-up using magnetic resonance imaging (MRI) is essential for the early detection of recurrence, but requires profound knowledge of therapy-related imaging changes.A structured PubMed literature search covering the period from 2000 to 2025 was conducted using the keywords "hepatocellular carcinoma," "magnetic resonance imaging," "thermal ablation," "transarterial chemoembolization," "transarterial radioembolization," "stereotactic body radiotherapy," and "treatment response." In addition, the study incorporated current national and international guidelines, as well as institutional clinical experience.Post-interventional imaging changes on MRI vary depending on the therapeutic approach applied. Typical morphological changes are observed immediately after thermoablation and TACE, whereas therapeutic effects of SIRT and SBRT become clearly evident only after weeks to months. Profound knowledge of standardized evaluation systems such as mRECIST, EASL, and LI-RADS-TR is crucial to ensure a precise and structured assessment of therapeutic response.Knowledge of specific MRI findings and standardized assessment systems is essential for structured follow-up of hepatocellular carcinoma after interventional therapy. Limitations arise from the heterogeneity of imaging findings, variable temporal patterns, and potential influences of combination therapies. Systemic therapies were not considered, restricting generalizability. · Magnetic resonance imaging is essential for assessing treatment response and for the early detection of recurrence after interventional therapy of hepatocellular carcinoma.. · Morphological changes after therapy are procedure-dependent and show marked differences over time: SIRT and SBRT demonstrate delayed changes, whereas TACE and thermal ablation present immediate effects.. · Standardized classification systems (mRECIST, EASL, LI-RADS-TR) provide a structured and reproducible framework for evaluating treatment response.. · Knowledge of characteristic imaging findings and potential pitfalls is crucial to reliably differentiate between residual tumor, recurrence, and therapy-induced changes.. · This review contributes to the current body of knowledge by systematically consolidating available evidence and presenting it in a practice-oriented manner in the context of MRI follow-up imaging.. · Kübler J, Ashkar A, Winkelmann MT et al. MRI after Interventional Therapy of Hepatocellular Carcinoma: Typical Changes over Time. Rofo 2025; DOI 10.1055/a-2724-6488.