Publications by authors named "Daniele Zefiro"
Objectives: This multicentric study was carried out to investigate the impact of small field output factors (OFs) inaccuracies on the calculated dose in volumetric arctherapy (VMAT) radiosurgery brain plans.
Methods: Nine centres, realised the same five VMAT plans with common planning rules and their specific clinical equipment Linac/treatment planning system commissioned with their OFs measured values (OFbaseline). In order to simulate OFs errors, two new OFs sets were generated for each centre by changing only the OFs values of the smallest field sizes (from 3.
Background: Hemorrhoidal disease is very common in western countries and rectal bleeding is the main symptom complained by patients. Nowadays the ultimate goal of treatment is to block the bleeding with minimally-invasive techniques to minimize post-procedural pain.
Objective: The aim of this study is to assess the preliminary results of the emborrhoid technique (embolization of the superior rectal arteries branches) as a new tool for the proctologist to treat severe bleeding hemorrhoids causing anemia.
Article Synopsis
- The study aimed to compare liver iron concentration (LIC) estimates obtained from R2* measurements using three different software programs, focusing on their accuracy against a standard method called FerriScan.
- A total of 15 patients' MRIs were analyzed, with particular attention to longitudinal changes in LIC through 34 serial examinations.
- Findings indicated that the Quanta Hematology program showed the closest agreement to the FerriScan estimates, and it was determined that R2* LIC values tend to be higher than R2 LIC values when iron levels are low, while the situation reverses as iron concentration increases.
Objective: To assess the diagnostic performance of a T1-independent, T2*-corrected multiecho magnetic resonance imaging (MRI) technique for the quantification of hepatic steatosis in a cohort of patients affected by chronic viral C hepatitis, using liver biopsy as gold standard.
Methods: Eighty-one untreated patients with chronic viral C hepatitis were prospectively enrolled. All included patients underwent MRI, transient elastography, and liver biopsy within a time interval <10 days.
Purpose: A preliminary assessment of the MRI-compatibility of metallic object possibly embedded within the patient is required before conducting the MRI examination. The Magnetic Iron Detector (MID) is a highly sensitive susceptometer that uses a weak magnetic field to measure iron overload in the liver. MID might be used to perform a screening procedure for MRI by determining the ferromagnetic/conductive properties of embedded metallic objects.
View Article and Find Full Text PDFUnlabelled: Infiltrative astrocytomas (IAs) represent a group of astrocytic gliomas ranging from low-grade to highly malignant, characterized by diffuse invasion of the brain parenchyma. When compared with their adult counterpart, pediatric IAs may be considered biologically distinct entities; nevertheless, similarly to those in adults they represent a complex oncologic challenge. The aim of this study was to investigate the diagnostic role, clinical contribution, and prognostic value of fused (18)F-3,4-dihydroxyphenylalanine ((18)F-DOPA) PET/MR images in pediatric supratentorial IAs.
View Article and Find Full Text PDFObjective: The objective of our prospective monocentric work was to determine the diagnostic value of real-time elastography (RTE) in the assessment of liver fibrosis in patients with iron overload, using transient elastography (TE) as reference standard.
Methods: Sixty-seven consecutive patients with MRI detectable iron overload (T2*<6.3 ms) were enrolled.