Publications by authors named "Florian Streitparth"
Background: Postoperative management of patients undergoing visceral surgery can present challenging clinical situations with significant morbidity and mortality. Interventional radiological techniques offer quick, safe, and effective minimally invasive treatment options in the postoperative management of visceral surgery.
Summary: Most commonly done procedures include - but are not limited to - fluid or abscess drainage, biliary diversion, bleeding embolization, and re-canalization of a thrombosed vessel.
Background: TIPS is an established treatment for portal hypertension. The aim was to analyze how patient selection for TIPS implantation and procedural aspects have changed over 25 years. Routinely collected demographic, clinical, laboratory, and procedural data of 835 patients treated with TIPS in a single center were used.
View Article and Find Full Text PDFBackground: Aim of this study was to investigate short-term and long-term treatment outcome, complication rates, and patient satisfaction after MRI-guided laser ablation (LA) of osteoid osteoma (OO).
Methods: Thirty-five patients with OO in typical and atypical localizations were treated by MRI-guided LA with MRI thermometry in an open 1.0 T system.
Purpose: Duodenal involvement in COVID-19 is poorly studied. Aim was to describe clinical and histopathological characteristics of critically ill COVID-19 patients suffering from severe duodenitis that causes a significant bleeding and/or gastrointestinal dysmotility.
Methods: In 51 critically ill patients suffering from SARS-CoV-2 pneumonia, severe upper intestinal bleeding and/or gastric feeding intolerance were indications for upper gastrointestinal endoscopy.
Clinical Issue: Chest X‑ray is the most commonly performed X‑ray examination in children and adolescents. The aim of this review is to present the benefit of this radiologic modality, but also its limitations.
Methods: Compared with older children, most X‑ray examinations of the chest were performed in newborns.
Objectives: To compare the diagnostic value of ultrashort echo time (UTE) magnetic resonance imaging (MRI) for the lung versus the gold standard computed tomography (CT) and two T1-weighted MRI sequences in children.
Methods: Twenty-three patients with proven oncologic disease (14 male, 9 female; mean age 9.0 + / - 5.
Article Synopsis
- The study aimed to assess the feasibility, safety, and effectiveness of MRI-guided lumbar facet joint radiofrequency denervation (FRD) for patients suffering from chronic low back pain.
- The research involved a preclinical analysis with an animal model to determine the best technical approach, followed by a clinical trial with 17 patients, measuring pain relief and muscle changes before and after the procedure.
- Results showed successful procedures with significant pain reduction after one week and six months, alongside an increase in multifidus muscle volume, suggesting that MRI-guided FRD could be a promising treatment option.
Purpose: To validate the collapsed cone (CC) algorithm against Monte Carlo (MC) simulations for model-based dose calculations in high-dose-rate (HDR) liver brachytherapy.
Methods And Materials: Doses for liver brachytherapy treatment plans of 10 cases were retrospectively recalculated with a model-based approach using Monte Carlo n-Particle Code (MCNP) 6 (Dm,m-MC) and Oncentra Brachy ACE (Dm,m-ACE). Tissue segmentation consisted of assigning uniform compositions and mass densities to predefined Hounsfield Unit (HU) thresholds.
Background: In unresectable hepatocellular carcinoma several local ablative treatments are available. Among others, radiation based treatments such as stereotactic body radiotherapy (SBRT) and high-dose rate interstitial brachytherapy (HDR BT) have shown good local control rates.
Methods: We conducted a dose comparison between actually performed HDR BT versus virtually planned SBRT to evaluate the respective clinically relevant radiation exposure to uninvolved liver tissue.
During the current COVID-19 pandemic, the triage, assessment, and management of patients presenting to the emergency department with critical conditions has become -challenging. The clinical features of COVID-19 are heterogeneous and subtle in many cases. They may easily be overlooked in the case of other acute diseases.
View Article and Find Full Text PDFPurpose: To evaluate feasibility, embolization success, biodegradability, reperfusion, and biocompatibility of biodegradable microspheres (MS) made from polydioxanone (PDO) for transcatheter arterial embolization.
Materials And Methods: Unilateral selective renal embolization of a segmental artery was performed in 16 New Zealand White rabbits with PDO-MS (100-150 μm and 90-315 μm). Animals were randomly assigned to different observation periods and underwent control digital subtraction angiography (DSA) and MR imaging immediately (n = 3), 1 week (n = 2), 4 weeks (n = 2), 8 weeks (n = 2), 12 weeks (n = 5), and 16 weeks (n = 2) after embolization.
Article Synopsis
- The study estimates the human resources needed for a quality review of routine diagnostic procedures in the Radiology Department at Bern University Hospital.
- Three radiologists evaluated 150 examinations for reporting quality, using a scoring system (RADPEER score) to indicate the accuracy of interpretations.
- Results showed high agreement among reviews, with 91.1% receiving the highest score, but also highlighted the time-intensive nature of the process, suggesting that substantial resources are necessary for an effective peer review system while still being feasible.
Purpose: To assess feasibility, embolization success, biodegradability, reperfusion, biocompatibility and in vivo visibility of novel temporary microspheres (MS) for transcatheter arterial embolization.
Material And Methods: In 9 New Zealand white rabbits unilateral superselective embolization of the lower kidney pole was performed with biodegradable MS made of polydioxanone (PDO) (size range 90-300 and 200-500 µm) impregnated with super-paramagnetic iron oxide (SPIO). Magnetic resonance imaging (MRI) was performed post-interventionally to assess in vivo visibility.
Purpose: To compare treatment plans for interstitial high dose rate (HDR) liver brachytherapy with Ir calculated according to current-standard TG-43U1 protocol with model-based dose calculation following TG-186 protocol.
Methods: We retrospectively evaluated dose volume histogram (DVH) parameters for liver, organs at risk (OARs) and clinical target volumes (CTVs) of 20 patient cases diagnosed with hepatocellular carcinoma (HCC) or metastatic colorectal cancer (mCRC). Dose calculations on a homogeneous water geometry (TG-43U1 surrogate) and on a computed tomography (CT) based geometry (TG-186) were performed using Monte Carlo (MC) simulations.
Article Synopsis
- Smart MAR is a post-processing algorithm designed to reduce metal artifacts in CT scans caused by orthopedic implants, which enhances visualization of surrounding tissues.
- A study involving 72 patients with various implants showed that Smart MAR significantly improved both subjective and objective image quality, leading to higher diagnostic confidence compared to standard methods.
- However, while Smart MAR improved overall image quality, it also introduced new artifacts in some cases, suggesting that it should be used cautiously as a supplementary tool in evaluating implant-related issues.
Purpose: Evaluation of the efficacy and safety of chemical renal denervation by image-guided periarterial ethanol injection in pigs with emphasis on histopathological characteristics.
Materials And Methods: Unilateral renal periarterial ethanol injection under general anesthesia was performed in 16 animals with the contralateral kidney serving as the control. All interventions were performed in an open MRI system under real-time multiplanar guidance.
Purpose: While ostoeid osteomas (OO) are typically located in long tubular bones, OO occurring elsewhere are referred to as "atypical". Aim of our study was to review the characteristics of atypically located OO, course of symptoms and therapy, as well as clinical outcome, safety, and patient satisfaction of radiofrequency ablation (RFA).
Materials And Methods: In the period from 04/01 to 07/13, 33 patients were treated using thermal ablation (RFA or laser), partly with low temperature and short duration technique.
Article Synopsis
- The study aimed to evaluate if the Smart MAR metal artifact reduction tool enhances image quality and diagnostic confidence in patients with dental artifacts compared to standard ASIR V reconstructions.
- The research included 100 patients with nonremovable dental materials and suspected head and neck pathologies, assessing image quality through both objective measurements and subjective evaluations by independent raters.
- Results indicated that Smart MAR significantly enhanced image quality by reducing noise and improving visibility of tumors or abscesses, detecting lesions that standard ASIR V alone missed in 22% of cases.
Article Synopsis
- SCT provides additional insights into lung cancer treatment response beyond just lesion size.
- In a study of 83 advanced NSCLC patients undergoing chemoradiotherapy, a significant correlation was found between iodine content in tumors and treatment outcomes.
- Higher iodine values during hotspot analysis were associated with progressive disease, suggesting that SCT-derived metrics could be valuable in predicting cancer recurrence.
Article Synopsis
- The study investigates if virtual non-contrast (VNC) images can replace real non-contrast (RNC) images in CT scans for detecting acute thoracoabdominal bleeding.
- VNC images effectively reduced the visibility of iodine compared to RNC images, while also showing better signal-to-noise ratios.
- By using VNC instead of RNC, the study suggests a safer protocol that reduces radiation exposure by 30%, particularly with low-keV images improving detection confidence.
Background: Hip joint loading is dominated by muscular activity. Thus, contact forces exceeding many times one's body weight are a consequence of imbalanced muscular activity. The objective was to analyze the influence of muscle atrophy after total hip arthroplasty on in vivo hip joint contact loading initially and long term.
View Article and Find Full Text PDFArticle Synopsis
- The study examines how implementing subspecialization in a radiology department impacts radiologists' work profiles and reporting times.
- A comparison of radiologic examinations from 2014 to 2016 showed a 10.3% increase in overall exams, but most radiologists reported fewer types of examinations after the change.
- Although subspecialization helps radiologists focus on their expertise, it led to longer report turnaround times for most, indicating a trade-off between specialization and efficiency.