Search results for " multidetector CT"

showing 4 items of 4 documents

Adult exposures from MDCT including multiphase studies: first Italian nationwide survey.

2014

To evaluate the radiation dose in routine multidetector computed tomography (MDCT) examinations in Italian population.This was a retrospective multicentre study included 5,668 patients from 65 radiology departments who had undergone common CT protocols: head, chest, abdomen, chest–abdomen–pelvis (CAP), spine and cardiac. Data included patient characteristics, CT parameters, volumetric CT dose index (CTDIvol) and dose length product (DLP) for each CT acquisition phase. Descriptive statistics were calculated, and a multi-regression analysis was used to outline the main factors affecting exposure.The 75th percentiles of CTDIvol (mGy) and DLP (mGy cm) for whole head were 69 mGy and 1,312 mGy cm…

AdultMaleRadiography Abdominalmedicine.medical_specialtyNationwide survey; Radiation protection; Multidetector CT; Patient dose; Diagnostic reference levelsMultidetector ctNationwide surveyRadiation DosageDiagnostic reference levelsSettore MED/01 - Statistica MedicaSurveys and QuestionnairesMultidetector computed tomographyMultidetector Computed TomographymedicineHumansRadiology Nuclear Medicine and imagingMedical physicscardiovascular diseasesNeuroradiologyRetrospective StudiesRadiation protectionbusiness.industryMultidetector CTRadiation doseGeneral MedicineItalian populationSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)surgical procedures operativeItalycardiovascular systemPatient doseFemaleRadiography ThoracicRadiologybusinessSettore MED/36 - Diagnostica Per Immagini E RadioterapiaNationwide surveyPatient doseEuropean radiology
researchProduct

Italian multicenter, prospective study to evaluate the negative predictive value of 16- and 64-slice MDCT imaging in patients scheduled for coronary …

2009

This was a prospective, multicenter study designed to evaluate the utility of MDCT in the diagnosis of coronary artery disease (CAD) in patients scheduled for elective coronary angiography (CA) using different MDCT systems from different manufacturers. Twenty national sites prospectively enrolled 367 patients between July 2004 and June 2006. Computed tomography (CT) was performed using a standardized/optimized scan protocol for each type of MDCT system (> or =16 slices) and compared with quantitative CA performed within 2 weeks of MDCT. A total of 284 patients (81%) were studied by 16-slice MDCT systems, while 66 patients (19%) by 64-slice MDCT scanners. The primary analysis was on-site/off…

Coronary angiographyAdultDiagnostic ImagingMalemedicine.medical_specialtyCoronary Artery DiseaseCoronary Angiographydiagnosis/radiographyCoronary artery diseasemethodsCoronary artery disease16- and 64-slice MDCT imaging coronary angiographySettore MED/36 - Diagnostica per Immagini e RadioterapiaPredictive Value of TestsCoronary Angiography/*methods Coronary Artery Disease/*diagnosis/*radiography Diagnostic Imaging/methods80 and overCardiac CTMedicineHumansRadiology Nuclear Medicine and imagingIn patientcardiovascular diseasesProspective StudiesProspective cohort studyTomographyNeuroradiologyAgedAged 80 and overmedicine.diagnostic_testbusiness.industryMultidetector CTNon invasiveReproducibility of ResultsInterventional radiologyGeneral MedicineAdult Aged Aged; 80 and over Coronary Angiography; methods Coronary Artery Disease; diagnosis/radiography Diagnostic Imaging; methods Female Humans Italy Male Middle Aged Predictive Value of Tests Prospective Studies Reproducibility of Results Tomography; X-Ray Computed; methodsMiddle Agedmedicine.diseasePredictive valueSettore MED/11 - Malattie Dell'Apparato CardiovascolareX-Ray Computedcoronary angiographyCTCardiac CT; Coronary artery disease; Multidetector CTItalyFemaleRadiologycoronary angiographybusinessTomography X-Ray Computed
researchProduct

SEMI-AUTOMATIC VOLUMETRIC SEGMENTATION OF THE UPPER AIRWAYS IN PATIENTS WITH PIERRE ROBIN SEQUENCE

2014

Pierre Robin malformation is a rare craniofacial dysmorphism whose pathogenesis is multifactorial. Although there is some agreement in non-invasive treatment in less severe cases, the dispute is still open on cases with severe respiratory impairment. We present a semi-automatic novel diagnostic tool for calculating upper airway volume, in order to eventually address surgery in patients with Pierre Robin Sequence (PRS). Multidetector CT datasets of two patients and two controls were tested to assess the proposed method for ROI segmentation, upper airway volume computation and three-dimensional reconstructions. The experimental results show an irregular pattern and a severely reduced cross-s…

MalePathologymedicine.medical_specialtymultidetector CTJaccard indexMultidetector ctImaging Three-DimensionalSimilarity (network science)Multidetector Computed TomographyImage Processing Computer-AssistedMedicineHumansRadiology Nuclear Medicine and imagingIn patientSegmentationairway model reconstructionRobin SequencePierre Robin sequenceAnatomy Cross-SectionalPierre Robin Syndromebusiness.industryairways segmentationInfantGeneral MedicineOriginal ArticlesOrgan SizePIERRE ROBIN SEQUENCE MULTIDETECTOR CT3D renderingAirway ObstructionRegion growingCase-Control StudiesPharynxFemaleNeurology (clinical)LarynxAirwaybusinessNuclear medicineregion growing
researchProduct

An edge-driven 3D region-growing approach for upper airway morphology and volume evaluation in patients with Pierre Robin sequence

2015

Abstract: Pierre Robin sequence (PRS) is a pathological condition responsible for a sequence of clinical events, such as breathing and feeding difficulties, that must be addressed to give the patient at least a chance to survive. By using medical imaging techniques, in a non-intrusive way, the surgeon has the opportunity to obtain 3D views, reconstruction of the regions of interest (ROIs), useful to increase understanding of the PRS patient’s condition. In this paper, a semi-automatic approach for segmentation of the upper airways is proposed. The implemented approach uses an edge-driven 3D region-growing algorithm to segment ROIs and 3D volume-rendering technique to reconstruct the 3D mode…

Pierre Robin sequence multidetector CT airways segmentation region growing 3D rendering airway model reconstructionInternational Journal of Adaptive and Innovative Systems
researchProduct