Search results for "Immagini"

showing 10 items of 616 documents

Whole-body MRI radiomics model to predict relapsed/refractory Hodgkin Lymphoma: A preliminary study.

2022

Purpose A strong prognostic score that enables a stratification of newly diagnosed Hodgkin Lymphoma (HL) to identify patients at high risk of refractory/relapsed disease is still needed. Our aim was to investigate the potential value of a radiomics analysis pipeline from whole-body MRI (WB-MRI) exams for clinical outcome prediction in patients with Hodgkin Lymphoma (HL). Materials and methods Index lesions from baseline WB-MRIs of 40 patients (22 females; mean age 31.7 ± 11.4 years) with newly diagnosed HL treated by ABVD chemotherapy regimen were manually segmented on T1-weighted, STIR, and DWI images for texture analysis feature extraction. A machine learning approach based on the Extra T…

AdultPositron emission tomographymedicine.medical_specialtyWhole body mriBiomedical EngineeringBiophysicsVinblastineBleomycinYoung AdultRefractoryRadiomicsPositron Emission Tomography Computed TomographyMachine learningAntineoplastic Combined Chemotherapy ProtocolsMedicineHumansRadiology Nuclear Medicine and imagingMagnetic resonance imaging Positron emission tomography Machine learning Texture analysis Hodgkin Lymphomamedicine.diagnostic_testHodgkin Lymphomabusiness.industryMagnetic resonance imagingMetabolic tumor volumeHodgkin DiseaseMagnetic Resonance ImagingDacarbazineTexture analysisPositron emission tomographyDoxorubicinRelapsed refractoryHodgkin lymphomaFemaleRadiologySettore MED/36 - Diagnostica Per Immagini E RadioterapiabusinessMagnetic resonance imaging
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Characterisation of indeterminate focal breast lesions on grey-scale ultrasound: role of ultrasound elastography.

2011

PURPOSE: This study was undertaken to evaluate the role of ultrasound (US) elastography in characterising focal breast lesions classified as indeterminate on B-mode US. MATERIALS AND METHODS: Eighty-four focal breast lesions, 64 benign and 20 malignant (mean diameter, 15.1 mm), detected but not characterised on B-mode US in 72 women, Breast Imaging Reporting and Data System (BI-RADS) US category 3 (n=56) or category 4 (n=28), were studied with US elastography and classified in consensus by two radiologists according to a five-point colour scale. Sensitivity, specificity and positive and negative predictive values (PPV and NPV) of US elastography compared with conventional US were calculated…

Adultmedicine.medical_specialtyBreast NeoplasmsGrey scaleSensitivity and SpecificityDiagnosis DifferentialElasticity Imaging TechniquesPredictive Value of TestsmedicineUltrasound elastographyHumansRadiology Nuclear Medicine and imagingProspective StudiesNeuroradiologyAgedAged 80 and overmedicine.diagnostic_testbusiness.industryUltrasoundInterventional radiologyGeneral MedicineMiddle AgedElasticity Imaging TechniquesFemaleRadiologyElastographyUltrasonography MammaryBreast Ultrasound elastography Breast neoplasmsbusinessIndeterminateSettore MED/36 - Diagnostica Per Immagini E RadioterapiaAlgorithms
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Lymphoscintigraphy with peritumoral injection versus lymphoscintigraphy with subdermal periareolar injection of technetium-labeled human albumin to i…

2014

Background Preoperative lymphoscintigraphy is without doubt a valid method for the detection of the sentinel lymph node (SLN). There has been considerable debate regarding the optimal site for the introduction of the tracer; various sites include peritumoral (PT), periareolar (PA), subdermal, and intradermal injection. Purpose To evaluate retrospectively the lymphoscintigraphic identification rate of peritumoral (PT) injection versus subdermal periareolar (PA) injection in the detection of SLNs in breast cancer. Material and Methods Between October 2002 and December 2011, a cohort of 906 consecutive patients with biopsy proven breast cancer underwent 914 SLN biopsy procedures. A total of 33…

Adultmedicine.medical_specialtySentinel lymph nodechemistry.chemical_elementBreast NeoplasmsInjections IntralesionalTechnetiumPeriareolarBreast cancerBiopsymedicineCarcinomaHumansRadiology Nuclear Medicine and imagingTechnetium Tc 99m Aggregated AlbuminAgedRetrospective StudiesAged 80 and overBreast cancer sentinel lymph node biopsy lymphoscintigraphy sub areolar peritumoral radio-colloidRadiological and Ultrasound Technologymedicine.diagnostic_testSentinel Lymph Node Biopsybusiness.industryHuman albuminGeneral MedicineMiddle AgedImage Enhancementmedicine.diseaseSurgerychemistryFemaleLymphRadiopharmaceuticalsSettore MED/36 - Diagnostica Per Immagini E RadioterapiaNuclear medicinebusinessLymphoscintigraphyActa Radiologica
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Abdominal Computed Tomography Angiography at 80kV: feasibility study.

2014

preliminary evaluation of different dose reduction algorithms in abdominal Computed Tomography Angiography (CTA) with standard scan protocols at 120kV vs. 80kV.prospective, randomized, crossover study. 60 consecutive patients who underwent CTA of the abdomen (Sensation 64, Siemens; Iomeprol 400 mgl/ml Bracco) for suspected or diagnosed Abdominal Aortic Aneurysm (AAA) were enrolled in the study. A standard 120kV/200mAs scan protocol was acquired in all patients (reference tube current modulated with Automatic Exposure Control). In each patient a second scan with 80kV/300mAs (Group 1; n. 20), 80kV/400mAs (Group 2; n. 20), 80kV/500mAs (Group 3; n. 20) was acquired. We used the same scan/recons…

Aged 80 and overMaleCross-Over StudiesAngiographyMiddle AgedRadiation Dosage120kV signal noiseComputed Tomography Abdominal CT Angiography radiation dose 80kVFeasibility StudiesHumansFemaleProspective StudiesSettore MED/36 - Diagnostica Per Immagini E RadioterapiaTomography X-Ray ComputedAlgorithmsAgedAortic Aneurysm AbdominalActa bio-medica : Atenei Parmensis
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ALANINE/ESR DOSIMETRY FOR TOTAL BODY IRRADIATION USING AN ANTHROPOMORPHIC PHANTOM

2016

Introduction: Total Body Irradiation (TBI) is a technique widely used in the radiation blood-oncology in the treatment of patients that need bone marrow transplantation or peripheral stem cell transplantation. This technique has some limitations such as the lack of homogeneity of the dose distribution (which may show variations of 20% in the different areas), irradiation of critical organs such as the lungs, the liver, the intestine and the eye-lens which can receive a dose comparable to that nominal and require appropriate shielding and a proper evaluation of the dose absorbed by them. The positive outcome of this type of radiation therapy is strictly related to a precise and accurate meas…

AlanineMaterials sciencebusiness.industrySettore FIS/01 - Fisica SperimentaleBiophysicsGeneral Physics and AstronomyGeneral MedicineTotal body irradiationSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)Esr dosimetryNuclear magnetic resonanceRadiology Nuclear Medicine and imagingAnthropomorphic phantomESR EPR Dosimetry TBINuclear medicinebusinessSettore MED/36 - Diagnostica Per Immagini E Radioterapia
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Studio di segmentazione morfovolumetrica in pazienti con declino cognitivo lieve amnestico (aMCI) e demenza di Alzheimer (AD) rispetto ad un gruppo d…

2016

SCOPO: Presentare i risultati preliminari di un’analisi di segmentazione morfovolumetrica (VBM) eseguita in pazienti con aMCI ed AD rispetto ad una popolazione di controllo (NAB). Tali dati saranno in futuro correlati ad altri parametri clinico-psicologici raccolti (età, sesso, scolarità, MMSE, ADL, IADL). MATERIALI E METODI: Sono stati sottoposti ad esame RM encefalo 103 soggetti, utilizzando uno scanner RM GE Signa HDxt da 1,5T ed acquisendo, tra le altre, una sequenza Sag 3D T1 FSPGR IR preped ASSET che è stata utilizzata per l’analisi VBM eseguita con il tool sienax (FSL). I risultati sono stati valutati in termini di valori medi e deviazioni standard mediante applicazione del t-test…

Alzheimer demenza declino cognitivo segmentazione morfovolumetrica risonanza magneticaSettore MED/37 - NeuroradiologiaSettore MED/36 - Diagnostica Per Immagini E Radioterapia
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un approccio teorico-sperimentale per la ricostruzione del profilo trasversale di rotaie usurate

2012

La sovrastruttura ferroviaria durante la sua vita utile è sottoposta oltre ai carichi dinamici generati dai rotabili (azioni verticali, laterali, ecc.), anche ai carichi termici e ad azioni ambientali di varia natura. Tali sollecitazioni, interagendo sinergicamente tra loro, determinano il deterioramento della sovrastruttura ferroviaria inteso come discostamento dalla configurazione geometrica di progetto e l’usura dei singoli componenti del binario e della massicciata. Per valutare lo stato di efficienza della sovrastruttura è consuetudine far riferimento ad alcuni parametri geometrici del binario che, peraltro, permettono di formulare un giudizio oggettivo circa il livello di sicurezza of…

Analisi delle Immagini precisione misure rapidità di calcolo.Settore ICAR/04 - Strade Ferrovie Ed AeroportiEdge detection
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MISURA DELLA CONCENTRAZIONE DI SOLIDI PARTICELLARI IN SISTEMI SOLIDO-LIQUIDO AGITATI MEDIANTE LASER PULSATO E ANALISI DI IMMAGINI

2008

Analisi di Immagini sospensioni solido-liquido
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TECNICHE OTTICHE PER IL MONITORAGGIO DEI CORSI D’ACQUA: UNA PROCEDURA AUTOMATICA PER L’INDIVIDUAZIONE DELLA MIGLORE SEQUENZA VIDEO DA PROCESSARE CON …

Misurare con accuratezza le portate di un corso d’acqua è uno dei principali obiettivi dell’idrometria tecnica (Eltner et al., 2020) e rappresenta da decenni una vera e propria sfida per la comunità scientifica. Le osservazioni di deflusso nei corsi d’acqua sono di fondamentale importanza per qualsiasi applicazione idrologica e idraulica (Pizarro et al., 2020) e consentono di comprendere al meglio le dinamiche di processi complessi, come ad esempio le piene lampo (Perks et al., 2016). La portata è una grandezza fisica la cui stima è caratterizzata da considerevole incertezza. Gli approcci tradizionali prevedono una stima indiretta della grandezza, attraverso un metodo velocità-area, che con…

Analisi di casi studio reali.Tecniche ottiche per il monitoraggio dei corsi d’acquaSettore ICAR/02 - Costruzioni Idrauliche E Marittime E IdrologiaProcedure di pre-processing ed enhancment delle immaginiInfluenza di densità e distribuzione del tracciante
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Aggressive Angiomyxoma: unusual pelvic mass

2016

Learning objectives Background Findings and procedure details Conclusion Personal information References

Angiomyxomagenetic structureseducationMRSettore MED/36 - Diagnostica Per Immagini E RadioterapiaContrast agent-intravenousPelvisCancer
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