Search results for " Medical imaging"

Implementation of dosimetry equipment and phantoms at the MedAustron light ion beam therapy facility

2017

Purpose: To describe the implementation of dosimetry equipment and phantoms into clinical practice of light ion beam therapy facilities. This work covers standard dosimetry equipment such as computerized water scanners, films, 2D-array, thimble and plane parallel ionization chambers, but also dosimetry equipment specifically devoted to the pencil beam scanning delivery technique such as water columns, scintillating screens or multi-layer ionization chambers. Method: Advanced acceptance testing procedures developed at MedAustron and complementary to the standard acceptance procedures proposed by the manufacturer are presented. Detailed commissioning plans have been implemented for each piece…

Contrast-enhanced ultrasound of hepatocellular carcinoma: where do we stand?

2019

Contrast-enhanced ultrasound (CEUS) represents a significant breakthrough in ultrasonography (US), and it is being increasingly used for the evaluation of focal liver lesions (FLLs). CEUS is unique in that it allows non-invasively assessment of liver perfusion in real time throughout the vascular phase, which has led to dramatic improvements in the diagnostic accuracy of US in the detection and characterization of FLLs, the choice of therapeutic procedures, and the evaluation of response. Currently, CEUS is included as a part of the suggested diagnostic work-up of FLLs, including in cirrhotic patients with hepatocellular carcinoma, resulting in better patient management and cost-effective d…

Atypical radiological presentation of multiple cystic brain metastases from lung cancer simulating neurocysticercosis.

2019

Brain metastases (BMs) are usually characterised by vasogenic oedema and mass effect, but cystic appearance can rarely occur, mimicking parasitosis, such as neurocysticercosis (NCC). A woman in her mid-50s was admitted for dizziness and upper left extremity paresis. Neuroimaging showed multiple cystic lesions consistent with multiple stages of NCC evolution, and empiric albendazole was started, without any clinical improvement. A whole-body CT revealed a pulmonary lesion in the right superior lobe. Pathological analysis from brain specimen demonstrated a clear cell lung carcinoma. The patient gradually worsened and died 4 months after the diagnosis. In conclusion, multiple cystic BMs are an…

Whole body magnetic resonance in indolent lymphomas under watchful waiting: The time is now.

2017

The indolent non-Hodgkin lymphomas (i-NHLs) are characterised by ‘indolent’ clinical behaviour with slow growth and prolonged natural history. The watchful waiting (WW) strategy is a frequently employed treatment option in these patients. This implies a strict monitoring by imaging examinations, including 18F-fluorodeoxyglucose-positron emission tomography/computed tomography (18F-FDG-PET/CT) and CT. A major concern is radiation exposure due to regularly monitoring by conventional imaging procedures. Several studies have demonstrated the reliability of whole-body magnetic resonance imaging (WB-MRI) for lymphoma staging. WB-MRI could be useful for active surveillance in i-NHLs providing the …

Structured Reporting of Solid and Cystic Pancreatic Lesions in CT and MRI: Consensus-Based Structured Report Templates of the German Society of Radio…

2020

 Radiological reports of pancreatic lesions are currently widely formulated as free texts. However, for optimal characterization, staging and operation planning, a wide range of information is required but is sometimes not captured comprehensively. Structured reporting offers the potential for improvement in terms of completeness, reproducibility and clarity of interdisciplinary communication. Interdisciplinary consensus finding of structured report templates for solid and cystic pancreatic tumors in computed tomography (CT) and magnetic resonance imaging (MRI) with representatives of the German Society of Radiology (DRG), German Society for General and Visceral Surgery (DGAV), working grou…

Guidelines Regarding §16 of the German Transplantation Act - Initial Experiences with Structured Reporting.

2017

ZIEL:  Übertragung des Befundungsbogens aus den Richtlinien zum Transplantationsgesetz (TPG) in ein standardkonformes Befundtemplate und Evaluation in der klinischen Routine. Das Template wurde mit der frei verfügbaren Software brackets.io erstellt. Die Implementierung des Templates in die klinische Routine erfolgte mithilfe einer in Eigenentwicklung programmierten Befundungsplattform. Schnittstellen zu RIS und PACS erlaubten eine Integration in den gewohnten Befundungsworkflow. Die Evaluationsperiode erstreckte sich über 70 Tage. Die Erstellung des Templates für die Umsetzung der Richtlinien war ohne Schwierigkeiten möglich. Der vorgegebene Befundungsbogen wurde hierbei inhaltlich eins zu …

Clinical support in radiation therapy scenarios: MR brain tumor segmentation using an unsupervised fuzzy C-Means clustering technique

2016

Magnetic Resonance Assessment of Left Ventricular Ejection Fraction at Any Time Post-Infarction for Prediction of Subsequent Events in a Large Multic…

2021

Background Magnetic resonance imaging (MRI) is the most accurate imaging technique for left ventricular ejection fraction (LVEF) quantification, but as yet the prognostic value of LVEF assessment at any time after ST-segment elevation myocardial infarction (STEMI) for subsequent major adverse cardiac event (MACE) prediction is uncertain. Purpose To explore the prognostic impact of MRI-derived LVEF at any time post-STEMI to predict subsequent MACE (cardiovascular death or re-admission for acute heart failure). Study Type Prospective. Population One thousand thirteen STEMI patients were included in a multicenter registry. Field Strength/Sequence 1.5-T. Balanced steady-state free precession (c…

A radiomics evaluation of 2D and 3D MRI texture features to classify brain metastases from lung cancer and melanoma

2017

[EN] Brain metastases are occasionally detected before diagnosing their primary site of origin. In these cases, simple visual examination of medical images of the metastases is not enough to identify the primary cancer, so an extensive evaluation is needed. To avoid this procedure, a radiomics approach on magnetic resonance (MR) images of the metastatic lesions is proposed to classify two of the most frequent origins (lung cancer and melanoma). In this study, 50 T1-weighted MR images of brain metastases from 30 patients were analyzed: 27 of lung cancer and 23 of melanoma origin. A total of 43 statistical texture features were extracted from the segmented lesions in 2D and 3D. Five predictiv…

Neurosurgical post-operative complications with incidental life-saving findings

2021

Abstract Neurosurgery is one of the most complex disciplines, requiring skillfulness and ability to try to cure nervous pathologies. Despite the role of this surgery in the inviolability of life, complications are relatively likely. Complications are frustrating and they contribute to produce a wrong but physiologic guilty conscience. However, sometimes they can have a sense over the rationale. In our study, we present two examples of post-operative complications of common neurosurgical pathologies. We compared our experience with the complications reported in literature and analyzed the importance of seeing the patients in their entirety, so encouraging a mindful approach in our medical da…