Pulmonary thromboembolism. Pulmonary embolism
Conditions
Interventions
Intervention 1: Intervention group: Patients suspected of pulmonary embolism referred to Shahid Faghihi Hospital (Shiraz) will be scanned by contrast agent reduction and radiation dose reduction proto
Sponsors
Shiraz University of Medical Sciences
Eligibility
Sex/Gender
All
Age
18 Years to No maximum
Inclusion criteria
Inclusion criteria: Patients who are suspicious of pulmonary emboly on the basis of clinical indication Abnormal level of plasma D-dimer Having deep veins thrombosis of lower limb age > 18 years BMI less than 30kg/m2 GFR greater than 60ml/min/1.73m2 Creatinine less than 1.3mg/ml Willingness to participate in the study and sign informed consent Does not have allergy to iodine contrast
Exclusion criteria
Exclusion criteria: Patient with severe pneumonia and atelectasis Confirmed pregnancy or suspicious of pregnancy Critically ill patient or hospitalized in ICU
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| The objective image quality of pulmonary CT Angio will be determined by radiologists through a scoring system. The quantitative image quality will be determined by quantitative parameters such as Signal-to-Noise Ratio. The quantity of radiation dose to the patient will be measured by the CT system. The related values will be shown on the Dose Report Page available at the end of the image series. Timepoint: The CT images will be sent to Picture Archiving and Communication System immediately after the scanning procedure completed. Then the qualitative and quantitative evaluation of the image quality of pulmonary CT Angio will perform. The results of the dose measurement will be available immediately after completing the scan. Method of measurement: Quantitative pulmonary Computed Tomography Angio (CTA) image quality will be measured by Signal-to-Noise Ratio (SNR). SNR results from the division of the mean CT density of the main pulmonary arteries (left and right) filled with contrast agent by the standard deviation of the background region (without contrast agent for example muscles surrounding the scapula). Qualitative pulmonary CT angiography is measured by the scores which are devoted to each series of images. Qualitative pulmonary CT angiography image quality will be measured by visual assessment. In this method the radiologist will use a scoring system on the basis of 5 scale scores as follow, (1) undiagnosable pulmonary CTA image (2) limited diagnostic value (3) sufficient diagnostic value (4) good image quality (5) excellent diagnostic value. Radiation dose to the patient will be measured by CT dose indices which are available on the page of dose report at the end of the CT image series. | — |
Countries
Iran (Islamic Republic of)
Contacts
Public ContactRezvan Ravanfar Haghighi
Shiraz University of Medical Sciences
Outcome results
None listed