Search results for "Contrast media"

showing 10 items of 323 documents

Contrast perception in digitized panoramic radiographs compared with their film-based origin

2002

Abstract Objectives. We sought to compare the visual image quality of film-based and digitized panoramic radiographs through use of a hole-containing test wedge. Study Design. An aluminum wedge containing 100 cells, of which 90 were given shallow holes, was exposed in the film-based Orthophos CD panoramic unit. Two radiographs subjectively exhibiting optimum contrast were selected. Films were digitized with a charge-coupled device flatbed scanner at 300 dpi. Films and digitized images were rated cellwise by 2 similar groups of 50 observers each with respect to spot perception. Results. The mean sensitivity was 0.26 ± 0.09 for film and 0.20 ± 0.07 for digitized images (P =.000), with a prono…

Contrast effectRadiographymedia_common.quotation_subjectContrast MediaSensitivity and SpecificityAbsorptiometry PhotonRadiography PanoramicHumansContrast (vision)MedicineGeneral DentistryDigital radiographymedia_commonObserver VariationPhantoms Imagingbusiness.industryX-Ray FilmReproducibility of ResultsRadiography Dental DigitalContrast perceptionOtorhinolaryngologyRadiographic Image Interpretation Computer-AssistedSurgeryOral SurgerybusinessNuclear medicineAnalog-Digital ConversionOral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology
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Prevalence of anatomical variants and coronary anomalies in 543 consecutive patients studied with 64-slice CT coronary angiography

2008

The aim of our study was to assess the prevalence of variants and anomalies of the coronary artery tree in patients who underwent 64-slice computed tomography coronary angiography (CT-CA) for suspected or known coronary artery disease. A total of 543 patients (389 male, mean age 60.5 +/- 10.9) were reviewed for coronary artery variants and anomalies including post-processing tools. The majority of segments were identified according to the American Heart Association scheme. The coronary dominance pattern results were: right, 86.6%; left, 9.2%; balanced, 4.2%. The left main coronary artery had a mean length of 112 +/- 55 mm. The intermediate branch was present in the 21.9%. A variable number …

Coronary angiographyAdultMalemedicine.medical_specialty64 slice ctCoronary Vessel AnomaliesContrast MediaCoronary Angiographymultislice computed tomographyIopamidolCoronary circulationInternal medicineCoronary CirculationCoronary artery circulation Multislice computed tomography Anatomical variants AnomaliesmedicinePrevalenceHumansRadiology Nuclear Medicine and imagingNeuroradiologyAgedAged 80 and overmedicine.diagnostic_testbusiness.industryInterventional radiologyGeneral MedicineMiddle Agedanatomical variantsIopamidolCoronary arteriesmedicine.anatomical_structurecoronary artery circulation; multislice computed tomography; anatomical variants; anomaliesRadiology Nuclear Medicine and imagingCardiologycoronary artery circulationRadiographic Image Interpretation Computer-AssistedanomaliesFemaleRadiologybusinessTomography X-Ray ComputedSettore MED/36 - Diagnostica Per Immagini E RadioterapiaCardiacmedicine.drugArteryEuropean Radiology
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Rationale, design and methods of CTCA-PRORECAD (Computed Tomography Coronary Angiography Prognostic Registry for Coronary Artery Disease): a multicen…

2013

PURPOSE: This study was done to assess the prognostic value of computed tomography coronary angiography (CTCA) in a large multicentre population of patients with suspected coronary artery disease (CAD) and, in particular, its incremental value compared with traditional methods for risk stratification. MATERIALS AND METHODS: This is a retrospective observational study that began in January 2003 conducted on patients with suspected CAD assessed with CTCA on the basis of symptoms (chest pain, dyspnoea) and/or abnormal or equivocal stress test and/or a high cardiovascular risk profile. The participating centres will provide data obtained with CTCA performed with 16-slice or higher equipment. Ex…

Coronary angiographyMaleContrast MediaComputed tomographyCoronary DiseaseCoronary AngiographyCoronary artery diseaseComputed tomography coronary angiographyCoronary artery diseaseComputer-AssistedRisk FactorsRegistriesTomographyNeuroradiologyeducation.field_of_studymedicine.diagnostic_testcomputed tomography coronary angiography; coronary artery disease; prevalence of disease; prognosis; registry; risk stratificationRadiographic Image InterpretationInterventional radiologyGeneral MedicineMiddle AgedPrognosisX-Ray ComputedResearch DesignRisk stratificationCardiologyPrevalence of diseaseRadiographic Image Interpretation Computer-AssistedFemaleRadiologymedicine.medical_specialtyRegistryPrognosiEndpoint DeterminationPopulationRisk AssessmentComputed tomography coronary angiography; Coronary artery disease; Prevalence of disease; Prognosis; Risk stratification; Registry; Analysis of Variance; Contrast Media; Coronary Disease; Endpoint Determination; Female; Humans; Male; Middle Aged; Prognosis; Proportional Hazards Models; Radiographic Image Interpretation Computer-Assisted; Retrospective Studies; Risk Assessment; Risk Factors; Coronary Angiography; Registries; Research Design; Tomography X-Ray ComputedInternal medicinemedicineHumansRadiology Nuclear Medicine and imagingeducationRisk stratificationProportional Hazards ModelsRetrospective StudiesAnalysis of Variancebusiness.industrymedicine.diseasebusinessTomography X-Ray ComputedLa Radiologia medica
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Improving diagnostic accuracy of MDCT coronary angiography in patients with mild heart rhythm irregularities using ECG editing

2006

OBJECTIVE. The objective of our study was to compare diagnostic accuracy of MDCT coronary angiography in a population of patients with mild heart rhythm irregularities before and after editing the ECG. SUBJECTS AND METHODS. Thirty-eight patients who underwent MDCT coronary angiography and conventional coronary angiography were enrolled in the study. The inclusion criterion was the presence of mild heart rhythm irregularities (i.e., premature beats; atrial fibrillation; mistriggering; or low heart rate, defined as 40 beats per minute or less) during the scan. All patients underwent MDCT with the following parameters: 16 detectors; collimation, 0.75 mm; gantry rotation time, 375 msec; 120 kV;…

Coronary angiographyMalemedicine.medical_specialtyCardiac Complexes PrematurePopulationContrast MediaDiagnostic accuracyCoronary AngiographySensitivity and SpecificityElectrocardiographyPredictive Value of TestsInternal medicineHeart rateAtrial FibrillationmedicineBradycardiaHumansRadiology Nuclear Medicine and imagingcardiovascular diseasesProspective Studieseducationeducation.field_of_studymedicine.diagnostic_testCardiac cyclebusiness.industryAtrial fibrillationGeneral Medicinearteriography coronary angiography ECG editing heart rhythm MDCT angiographyMiddle Agedmedicine.diseaseIopamidolHeart Rhythmcardiovascular systemCardiologyFemaleRadiologybusinessTomography X-Ray ComputedElectrocardiography
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Acceptance of noninvasive computed tomography coronary angiography: for a patient-friendly medicine.

2014

PURPOSE: This study was done to evaluate the psychological state and anxiety of patients undergoing computed tomography coronary angiography (CTCA), and assess their acceptance and satisfaction compared to invasive conventional coronary angiography (CCA). MATERIALS AND METHODS: A total of 442 consecutive patients (282 male; mean age 57.7 ± 9.5 years) who underwent CTCA for suspected or known coronary artery disease were evaluated with the Endler Multimodality Anxiety Scales (EMAS) before and after the scan, and a questionnaire administered after the scan. Among the 442 patients, 181 had a history of CCA. Two radiologists assessed the image quality of CTCA. RESULTS: Anxiety was more intense …

Coronary angiographyMalemedicine.medical_specialtyContrast MediaComputed tomographyCoronary DiseaseAnxietyCoronary AngiographyCoronary artery diseaseSex FactorsSurveys and QuestionnairesmedicineHumansRadiology Nuclear Medicine and imagingSettore MED/25 - PsichiatriaNeuroradiologyPsychiatric Status Rating Scalesmedicine.diagnostic_testbusiness.industryUltrasoundInterventional radiologyGeneral MedicineMiddle AgedPatient Acceptance of Health Caremedicine.diseaseIopamidolAnxietyRadiographic Image Interpretation Computer-AssistedFemaleRadiologyCoronary artery disease Anxiety Conventional coronary angiography CT coronary angiographymedicine.symptombusinessSettore MED/36 - Diagnostica Per Immagini E RadioterapiaTomography X-Ray ComputedLa Radiologia medica
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Right coronary artery arising from pulmonary trunk: assessment with conventional coronary angiography and multislice computed tomography coronary ang…

2009

We present a case of a 59-year-old man who was admitted to the hospital because of atypical chest pain and dyspnea. Conventional coronary angiography showed an anomalous origin of the right coronary artery from the pulmonary trunk. The patient underwent multislice computed tomography in order to clarify the origin and course of the anomalous vessel. The aim of this report is to emphasize the role of multislice computed tomography as an accurate noninvasive imaging tool in the evaluation of coronary artery anomalies.

Coronary angiographyRight coronary arteryMalemedicine.medical_specialtyCoronary Vessel AnomaliesContrast MediaPulmonary ArteryCoronary AngiographyIopamidolAngina PectorisPredictive Value of Testsmedicine.arterymedicineHumansPulmonary Trunkbusiness.industryGeneral MedicineMultislice computed tomographyMiddle AgedIopamidolmedicine.anatomical_structureDyspneaRight coronary arteryPredictive value of testsPulmonary arteryRadiologyCardiology and Cardiovascular MedicinebusinessTomography X-Ray ComputedArterymedicine.drugJournal of cardiovascular medicine (Hagerstown, Md.)
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Overdiagnosis and overimaging: an ethical issue for radiological protection

2019

Aims and objectives: This study aimed to analyse the key factors that influence the overimaging using X-ray such as self-referral, defensive medicine and duplicate imaging studies and to emphasize the ethical problem that derives from it. Materials and methods: In this study, we focused on the more frequent sources of overdiagnosis such as the total-body CT, proposed in the form of screening in both public and private sector, the choice of the most sensitive test for each pathology such as pulmonary embolism, ultrasound investigations mostly of the thyroid and of the prostate and MR examinations, especially of the musculoskeletal system. Results: The direct follow of overdiagnosis and overi…

Defensive MedicineMalemedicine.medical_specialtyThyroid GlandContrast MediaMedical OveruseoverdiagnosisSensitivity and Specificity030218 nuclear medicine & medical imagingDefensive medicine03 medical and health sciences0302 clinical medicinemedicineHumansWhole Body ImagingRadiology Nuclear Medicine and imagingBioethical IssuesEthicOverdiagnosisIntensive care medicineNeuroradiologyRadiation protectionethics; overdiagnosis; overimaging; radiation protectionmedicine.diagnostic_testOverimagingbusiness.industryProstatePhysician Self-ReferralInterventional radiologyGeneral MedicineRadiation ExposurePrivate sectorethicsMagnetic Resonance ImagingTest (assessment)Key factorsOverdiagnosi030220 oncology & carcinogenesisRadiological weaponRadiologybusinessLa radiologia medica
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Meningioma of the cerebellopontine angle mimicking benign paroxysmal positional vertigo.

2009

Not available

Diagnosis DifferentialMalemeningioma Benign paroxysmal positional vertigoMeningeal NeoplasmsVertigoContrast MediaHumansGadoliniumCerebellopontine AngleMiddle AgedMeningiomaMagnetic Resonance ImagingJournal of otolaryngology - headneck surgery = Le Journal d'oto-rhino-laryngologie et de chirurgie cervico-faciale
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Non invasive tools for the diagnosis of liver cirrhosis

2014

Liver cirrhosis (LC), the end stage of many forms of chronic hepatitis of different etiologies is a diffuse process characterized by fibrosis and the conversion of normal liver architecture into structurally abnormal nodules surrounded by annular fibrosis. This chronic progressive clinical condition, leads to liver cell failure and portal hypertension, which can favour the onset of hepatocellular carcinoma. Defining the phase of the natural history is crucial for therapeutic choice and prognosis. Liver biopsy is currently considered the best available standard of reference but it has some limits, so alternative tools have been developed to substitute liver biopsy when assessing liver fibros…

Diagnostic ImagingLiver Cirrhosismedicine.medical_specialtyCirrhosisSettore MED/09 - Medicina InternaBiopsyContrast MediaReviewSeverity of Illness IndexGastroenterologySerum markersPredictive Value of TestsFibrosisInternal medicineUltrasoundBiopsymedicineHumansLiver fibrosis; Liver biopsy; Ultrasound; Elastography; Serum markersmedicine.diagnostic_testbusiness.industryLiver cellGastroenterologyReproducibility of ResultsLiver fibrosiUltrasonography DopplerGeneral MedicineLiver biopsyPrognosismedicine.diseaseLiverLiver biopsyHepatocellular carcinomaElasticity Imaging TechniquesPortal hypertensionRadiologyElastographyElastographybusinessBiomarkers
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Imaging techniques for the vulnerable coronary plaque

2007

The goal of this article is to illustrate the main invasive and noninvasive diagnostic modalities to image the vulnerable coronary plaque, which is responsible for acute coronary syndrome. The main epidemiologic and histological issues are briefly discussed in order to provide an adequate background. Comprehensive coronary atherosclerosis imaging should involve visualization of the entire coronary artery tree and plaque characterization, including three-dimensional morphology, relationship with the lumen, composition, vascular remodelling and presence of inflammation. No single technique provides such a comprehensive description, and no available modality extensively identifies the vulnerab…

Diagnostic Imagingmedicine.medical_specialtyAcute coronary syndromeContrast MediaLumen (anatomy)Coronary Artery Diseasemultislice computed tomographymedicine.disease_causeSensitivity and SpecificityVascular remodelling in the embryoDiagnosis DifferentialCoronary artery diseaseCoronary artery disease Imaging Vulnerable plaque Multislice computed tomography CTImaging Three-DimensionalPredictive Value of TestsRisk FactorsInternal medicinemedicineHumansRadiology Nuclear Medicine and imagingCoronary atherosclerosisNeuroradiologyRupture Spontaneousmedicine.diagnostic_testbusiness.industryimagingInterventional radiologyGeneral Medicinemedicine.diseaseVulnerable plaqueCardiologyvulnerable plaqueRadiologybusinessCTLa radiologia medica
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