and others published [Diagnosis of suspected pulmonary embolism in pregnant women. We recommend CT of pulmonary arteries before scintigraphy] | Find,

The suboptimal opacification in pulmonary artery could be salvaged using low-energy virtual monoenergetic images (VMI) at rapid kVp switch dual energy CT. Objectives: To explore the potential improvement in pulmonary artery opacification and to assess the change in image quality parameters in VMI using fast switch kVp dual energy CT.

Since the emergence of CT pulmonary angiography as the primary diagnostic study for pulmonary embolism, there has been a near doubling in the detection of pulmonary embolism without a corresponding decrease in mortality The pulmonary arteries are not just affected by thrombus. Various acquired and congenital conditions can also affect the pulmonary arteries. In this review we discuss cross sectional imaging modalities utilized for the imaging of the pulmonary arteries. Suboptimal Contrast Opacification of Dynamic Head and Neck MR Angiography due to Venous Stasis and Reflux: Technical Considerations for Optimization D.R. Hingwala B. Thomas C. Kesavadas T.R. Kapilamoorthy BACKGROUND AND PURPOSE: Contrast-enhanced head and neck MRA may be degraded by venous stasis and reflux of contrast into the jugular veins.

While bolus-tracking technique aims to maximise contrast in the vessel of interest, early scanning may lead to incomplete Papers have suggested that approximately 10.8% of CTPAs may be suboptimal based on all causes, including poor contrast enhancement and motion artefact amongst other factors [2]. Therefore, the target has been defined as no more than 11% of CTPAs having HU <210 in the main pulmonary artery. Perrier and colleagues demonstrated a false-positive rate of 0% in the main pulmonary artery, 15% in the lobar pulmonary arteries, and 38% in the segmental pulmonary arteries . Since the emergence of CT pulmonary angiography as the primary diagnostic study for pulmonary embolism, there has been a near doubling in the detection of pulmonary embolism without a corresponding decrease in mortality The pulmonary arteries are not just affected by thrombus. Various acquired and congenital conditions can also affect the pulmonary arteries. In this review we discuss cross sectional imaging modalities utilized for the imaging of the pulmonary arteries.

Request PDF | Salvage of Suboptimal Enhancement of Pulmonary Artery in Pulmonary CT Angiography Studies: Rapid kVp Switch Dual Energy CT Experience | Background: Multidetector computed tomography The pulmonary arteries are part of the pulmonary circulation, which also includes pulmonary veins and pulmonary capillaries. The purpose of the pulmonary circulation is to transfer oxygen and carbon dioxide between the blood in the body and the air that's inhaled and exhaled in the lungs. Suboptimal enhancement of CT pulmonary angiograms leads to non diagnostic studies and therefore unnecessary exposure to contrast and radiation.

The suboptimal opacification in pulmonary artery could be salvaged using low- energy virtual monoenergetic images (VMI) at rapid kVp switch dual energy CT.

Post-processing of DECT data sets allows the generation of material decomposition images, including 2014-01-23 examinations, poor contrast opacification contributes to 40% of examinations and motion artifact to 74%. It has been suggested that optimal opacification in the main pulmonary artery should be 250 H. The goal of this project is to monitor and improve adherence to the use of standardized elements in CT pulmonary angiography reports.

Suboptimal opacification of the pulmonary arteries

Hounsfield Units (HU) of less than 200 measured in the main pulmonary artery (MPA) was considered suboptimal opacification. Potential contributing factors were grouped into four major categories, namely patient, radiologist, technologist, and equipment (Graph 1). Our technique was optimized based on current literature recommendations.

The patterns can broadly be divided into airspace opacification, lines and dots. The reasons for suboptimal opacification of the pulmonary artery included transient contrast interruption (n = 63), delayed start of scanning due to concurrent examinations of another body part (n = 6), contrast extravasation (n = 4), extremely large body size of the patient (n = 3), erroneous ROI placement in bolus tracking (n = 2), and technical error (n = 1). Transient interruption of contrast material was considered to be the cause when there was poor opacification of the pulmonary Hounsfield Units (HU) of less than 200 measured in the main pulmonary artery (MPA) was considered suboptimal opacification. Potential contributing factors were grouped into four major categories, namely patient, radiologist, technologist, and equipment (Graph 1). Our technique was optimized based on current literature recommendations. The most obvious anatomic causes for suboptimal opacification of the pulmonary arteries include obstruction of the superior vena cava, a substantial left-to-right shunt, or a patent foramen ovale – all of which will reduce opacification; up to a fifth of patients investigated have a patent foramen ovale and as a consequence there may be early opacification of the aorta, with suboptimal opacification of the pulmonary arteries, particularly if the scan is obtained at deep inspiration. (<60 keV) can (I) increase the enhancement of the pulmonary arteries when enhancement is suboptimal on single-energy images; and (II) provide optimal diagnostic enhancement of the pulmonary arteries using a reduced volume of iodinated contrast (5).

The reported incidence of isolated segmental PE ranges from 4% to 30% in various series.
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Bistrousa | 778-220 Phone Numbers | South Kamloops, In chest CT examinations in which the pulmonary artery is suboptimally enhanced, obtaining virtual monoenergetic images at a low energy setting using dual-layer detector spectral CT allows sufficient attenuation of the pulmonary artery to be achieved while preserving image quality and increasing diagnostic performance for detecting PE. In chest CT examinations in which the pulmonary artery is subopti- mally enhanced, obtaining virtual monoenergetic images at a low energy setting using dual- layer detector spectral CT allows sufficient attenuation of the pulmonary artery to be achieved while preserving image quality and increasing diagnostic performance for detecting PE. Pulmonary opacification represents the result of a decrease in the ratio of gas to soft tissue (blood, lung parenchyma and stroma) in the lung. When reviewing an area of increased attenuation (opacification) on a chest radiograph or CT it is vital to determine where the opacification is. The patterns can broadly be divided into airspace opacification, lines and dots. The reasons for suboptimal opacification of the pulmonary artery included transient contrast interruption (n = 63), delayed start of scanning due to concurrent examinations of another body part (n = 6), contrast extravasation (n = 4), extremely large body size of the patient (n = 3), erroneous ROI placement in bolus tracking (n = 2), and technical error (n = 1). Transient interruption of contrast material was considered to be the cause when there was poor opacification of the pulmonary Hounsfield Units (HU) of less than 200 measured in the main pulmonary artery (MPA) was considered suboptimal opacification.

I70-I79 Diseases of arteries, arterioles and capillaries › Other disorders of arteries and arterioles I77 Other I28 Other diseases of pulmonary vessels. and main pulmonary arteries, CT and US fail in visualizing the origin and intrapericardial portion of the left pulmonary artery [3]. From our study, it is clear MRI can recognize stenosis of the central pulmonary arteries, and can depict clearly the origin and intrapericardial portion of the LPA. Because of the rapidity of MDCT image acquisition, the contrast bolus can be completely missed resulting in inadequate opacification of the pulmonary arteries and an indeterminate scan. 6 This highlights an important difference between a routine MDCT scan of the chest and MD-CTPA, which is that the standard contrast injection flow rate for a routine scan is usually ∼4 mL/s.
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In chest CT examinations in which the pulmonary artery is suboptimally enhanced, obtaining virtual monoenergetic images at a low energy setting using dual-layer detector spectral CT allows sufficient attenuation of the pulmonary artery to be achieved while preserving image quality and increasing diagnostic performance for detecting PE.

6 This highlights an important difference between a routine MDCT scan of the chest and MD-CTPA, which is that the standard contrast injection flow rate for a routine scan is usually ∼4 mL/s. BACKGROUND AND PURPOSE: Contrast-enhanced head and neck MRA may be degraded by venous stasis and reflux of contrast into the jugular veins.

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The contrast opacificiation of the pulmonary arteries is suboptimal due to an increase in the flow of unopacified blood from the inferior vena cava (IVC) to the right side of the heart, often during deep inspiration 1.

It has been suggested that optimal opacification in the main pulmonary artery should be 250 H. The goal of this project is to monitor and improve adherence to the use of standardized elements in CT pulmonary angiography reports. Project Resources 2016-11-01 · In pregnant patients, larger blood volumes and increased cardiac output lead to earlier contrast opacification of the pulmonary arteries and dilution of contrast .