Search results for " radioterapia"
showing 10 items of 552 documents
Come quantificare la fibrosi del miocardio ventricolare sinistro mediante software semiautomatico in pazienti sottoposti a risonanza magnetica cardia…
2014
Transcranial Magnetic Resonance Imaging-Guided Focused Ultrasound with a 1.5 Tesla Scanner: A Prospective Intraindividual Comparison Study of Intraop…
2021
Background: High-quality intraoperative imaging is needed for optimal monitoring of patients undergoing transcranial MR-guided Focused Ultrasound (tcMRgFUS) thalamotomy. In this paper, we compare the intraoperative imaging obtained with dedicated FUS-Head coil and standard body radiofrequency coil in tcMRgFUS thalamotomy using 1.5-T MR scanner. Methods: This prospective study included adult patients undergoing tcMRgFUS for treatment of essential tremor. Intraoperative T2-weighted FRFSE sequences were acquired after the last high-energy sonication using a dedicated two-channel FUS-Head (2ch-FUS) coil and body radiofrequency (body-RF) coil. Postoperative follow-ups were performed at 48 h usin…
Corso base di Imaging RM del Sistema Nervoso Centrale
2013
Eziopatogenesi, neuropatologia, semeiotica RM e terapia della Sclerosi Multipla.
CAMBIAMENTI NEL NETWORK FUNZIONALE DELLA GRATIFICAZIONE DEI GIOCATORI D'AZZARDO PATOLOGICI: STUDIO DI RESTING STATE FMRI
2018
Scopo Indagare i cambiamenti di connettività funzionale nei giocatori patologici (GP) rispetto ai controlli sani (CS) mediante risonanza magnetica funzionale in condizioni di resting state. Materiale e metodi 13 CS e 14 GP sono stati reclutati in questo studio (tutti maschi destrimani, non in terapia farmacologica, età media 35,96 ± 9,56). Tutti i soggetti sono stati sottoposti ad RM encefalo utilizzando uno scanner da 1,5T. I dati di attivazione delle regioni cerebrali tra loro funzionalmente collegate sono stati ottenuti utilizzando un'analisi concat-ICA. Le componenti risultanti sono state quindi confrontate tra i due gruppi. Tra queste mappe sono state prese in considerazione solo que…
Electron Spin Resonance (ESR) characterization of phenol compounds as new materials for dosimetry in radiotherapy
2016
Among the various dosimetric techniques used for characterizing the radiation beams used in radiation therapy, the electron spin resonance (ESR) arouses increasing interest for applications in various therapy procedures [1]. Free radicals are known to be produced when a compound is irradiated with ionizing radiations. The concentration of radiation-induced free radicals is proportional to the absorbed dos e and this allows for dosimetric measurements through ESR technique which able to quantitatively determine the radical concentration [2]. Our research group has started an investigation of the ESR response of some phenols compounds for possible ESR dosimetric ap plications suitable feature…
Nuclear Magnetic Resonance investigation of PVA-GTA FRicke gel dosimeters exposed to clinical photon beams
2016
Fricke Xylenol Gel (FXG) dosimetric system is based on the radiation induced oxidation of ferrous (Fe2+) to ferric (Fe3+) ions. The application of Fricke gels for ionizing radiation dosimetry is continuously increasing worldwide due to their many favorable properties. However, one of their shortcomings is that ferrous and ferric ions diffuse in the gel matrix. To maintain the spatial integrity of the dose distribution, Fricke gels must be undergoing measurement within a few hours of their irradiation, so that ferric ions remain close to their point of production. Thus, the spatial integrity of the dose distribution in the Fricke gel is maintained. The gel matrix also contributes to the oxid…
Gel dosimeters for radiotherapy applications
2014
Dependence of MRI sensitivity of Fricke gel dosimeters exposed to clinical photons beams on ferrous ammonium sulfate content
2014
Analysis of response of PVA-GTA Fricke gel dosimeters through magnetic resonance imaging.
2017
The experimental activities here reported are focused on the analysis of the clinical applications of Fricke gel dosimeters produced with a matrix of Polyvinyl alcohol (PVA) cross-linked by adding glutaraldehyde (GTA). The analyses were performed by means of a 1.5 T clinical magnetic resonance imaging (MRI) scanner. The sensitivity of these dosimetric gels to clinical photon beams as well as the signal stability were suitably investigated. Furthermore, the effect of the xylenol orange on the MRI signal was analyzed. The results obtained show that these PVA-GTA gel dosimeters show good dosimetric features for possible future use for 3D dose mapping in clinical applications.
Dosimetria tramite Risonanza Elettronica di Spin (ESR) in RadioTerapia IntraOperatoria (IORT): misure di Output Factors e simulazioni Monte Carlo-GEA…
2016
La RadioTerapia IntraOperatoria (IORT) è una modalità di trattamento in cui una singola dose di radiazioni è impartita direttamente al letto tumorale o al tumore durante l'intervento chirurgico, evitando di colpire i tessuti sani circostanti. La fabbricazione di acceleratori lineari mobili per elettroni dedicati alla IORT ha permesso una grande diffusione di questa tecnica radioterapica. Lo scopo di questo lavoro è il confronto tra la risposta di dosimetri di alanina letti tramite Risonanza Elettronica di Spin (ESR) e di camere a ionizzazione Markus per le misurazioni degli Output Factors (OFs) di fasci di elettroni prodotti da un acceleratore lineare utilizzato per la IORT. Gli OFs dei fas…