Therefore, the use of contrast-enhanced CT rather than routine unenhanced CT may be considered for these patients. Upon expiration of these permissions, PMC is granted a perpetual license to make this article available via PMC and Europe PMC, consistent with existing copyright protections. Of these 280 patients, 129 (46%) underwent CT a mean of 9 days ± 5 (standard deviation) after symptom onset. The PIOPED II study found that patients with a low or intermediate clinical probability of pulmonary embolism and normal results on CTPA had a high negative predictive value for PE (96% for patients with a low probability and 89% for patients with an intermediate probability); however, the negative predictive value was 60% in patients with a high probability before CTPA. To detect abnormalities with low differences in CT contrast, and to improve pulmonary embolism conspicuity, it is necessary to adjust the display window widths and levels [17-19]. To comprehensively evaluate for venous thromboembolic disease, patients need to receive a large contrast material bolus to evaluate the lower-limb veins [7]. Although no published data as yet can validate this statement, preliminary work appears to support this observation [22, 23]. There are two principal approaches for performing a CTPA of high diagnostic quality: Purpose: To retrospectively review imaging characteristics of indeterminate computed tomographic (CT) pulmonary angiograms for pulmonary embolism (PE) and patient outcome. 1113, Proceedings of the Shevchenko Scientific Society. Patients with unenhanced chest CT scans were excluded. Yilmaz Ö, Üstün ED, Kayan M, et al. These signs include nonuniform arterial perfusion for both acute and chronic pulmonary embolism; this radiologic sign is difficult to identify in cases of acute pulmonary embolism but manifests as mosaic attenuation in cases of chronic pulmonary embolism. The fetal radiation dose from CT pulmonary angiography is substantially less than that from ventilation perfusion scintigraphy in all trimesters and even if half-dose perfusion-only scintigraphy is used [8-9]. Less complication than conventional (elevated pulmonary ... against which all other modalities have beenmeasured. Acta Radiol October 8, 2013 Further imaging may be necessary, either repeating CTPA with an increased delay or pulmonary angiography. 7, European Journal of Nuclear Medicine and Molecular Imaging, Vol. Over the past two decades, however, catheter angiography has become almost entirely supplanted by CT angiography (CTA), which is now the … Contrast-enhanced helical CT of the veins of the lower extremities is performed using the same contrast bolus as used for chest CT. 1, Journal of Thrombosis and Thrombolysis, Vol. The requirement for written informed consent was waived. 4, No. A transient interruption of contrast material consists of a portion of the pulmonary artery that shows relatively poor enhancement between areas of higher attenuation both proximally and distally [24, 25] (Fig. If an indeterminate scan occurs with standard delay due to poor enhancement, there is no extravasation of contrast material, and the timing is appropriate, then poor venous flow due to stenosis or obstruction may be a factor [8], in which case a different venous access site may be necessary. For CT Angiography, there is no need for sedation or general anesthesia. CT Pulmonary Angiography: A Comparative Analysis of the Utilization Patterns in Emergency Department and Hospitalized Patients Between 1998 and 2003. CTA (CTPA – CT pulmonary angiography) has been the technique of choice for detection of pulmonary embolism for at least the last decade . 18, No. Radiology 2005; 237: 329-337. Our routine protocol for patients with severe clinical features of COVID-19 infection was multidetector pulmonary CT angiography using a 256-slice multidetector CT scanner (Revolution; GE Healthcare, Milwaukee, Wis) after intravenous injection of 60 mL iodinated contrast material (Iomeprol, 400 mg of iodine per milliliter; Bracco Imaging, Milan, Italy) at a flow rate of 4 mL/sec, triggered on the … 15 December 2020 | Radiology: Cardiothoracic imaging, Vol nevertheless, our suggest... [ 32, 33 ] ( Fig support this observation [ 22, 23 ] send you the reset.... 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