What is CTA protocol?

Computed tomography angiography (CTA) is an imaging method of choice for a wide range of vascular diseases that span across different vascular territories. A diagnostic quality CTA requires a robust imaging protocol tailored according to the physiologic state and vascular area of interest.

How are CTA performed?

CT angiography is a type of medical test that combines a CT scan with an injection of a special dye to produce pictures of blood vessels and tissues in a part of your body. The dye is injected through an intravenous (IV) line started in your arm or hand.

What is the prep for a CTA?

How do I prepare for a CTA of the Coronary Arteries? To prepare for the CTA study, the patient should not eat for 4 hours prior to their scheduled appointment and should not drink or eat caffeinated products for 12 hours prior to their appointment. The patient should not exercise on the day of the exam.

What is SSD in CT scan?

“A shaded surface display (SSD) is a surface-rendered image that provides a realistically looking three-dimensional view of the surface of a structure of interest within the acquired volume set.” (

What is the difference between CT and CTA?

Computed tomography (CT) scan is a type of x-ray that uses a computer to take cross-sectional images of your body. Computed tomography angiography (CTA) combines a CT scan with a special dye or contrast material to produce pictures of blood vessels and tissues in a section of your body.

What is the difference between a CT scan and a CTA?

How do you prepare for IV contrast?

If you are receiving CT scan IV contrast, do not eat or drink 4 hours prior your exam. You may continue to drink water if you prefer. Continue to take all of your prescribed medications. Please do not bring children under age 12 to your appointment.

What is VRT in CT?

Shaded surface display volume rendering (SS-VRT) is a technique that creates a 3D visual illustration of CT volumetric data for display from any desired perspective. [9] SS-VRT images provide a sensation of three-dimensionality that is significantly superior to other volume rendering techniques.

What is MIP in CT scan?

Maximum intensity projection (MIP) is a simple three-dimensional visualization tool that can be used to display computed tomographic angiography data sets. MIP images are not threshold dependent and preserve attenuation information.

Which is better MRA or CTA?

In this study, the AUC of CTA and MRA for diagnosing intracranial aneurysm was 0.90 and 0.87, respectively. This indicates that CTA has a slight higher accuracy than MRA in diagnosis of intracranial aneurysms on the surface, which is consistent with several prior studies.

What is post processing technique in CT scan?

Post processing technique For the purpose of this review, a post-processing technique refers to a software package that is used to augment imaging obtained from CT scans, (which are conventionally presented as axial images), to provide additional 2- or 3-dimensional imaging and data relating to an aneurysm’s, size, position and anatomy.

What are the post-processing techniques of interest to you?

Post-processing techniques of interest include: multiplanar formatting automated/semi-automated systems for aneurysm-sizing slice thickness Comparator CTA alone Outcomes Downstream effects reflecting the technical and clinical success of surgery: Mortality Further AAA expansion AAA rupture Complications of surgery Resource use and cost

How do you determine the voxel size in CTA reconstruction?

Reconstruction (CTA) and acquisition (MRA) geometry: planar field of view(FoV), matrix size, slice thickness and reconstruction intervals are the key parameters that determine the voxel size. For high-quality reconstructions, the three axial dimensions of each voxel should be as similar as possible (isotropy) (Fig. 3. 3).

What are reconstruction filters (CTA)?

Reconstruction filters (CTA): the use of sharp reconstruction filters, which may lead to a better definition of vascular contours in planar images, introduce a reduction in the Signal-to-Noise Ratio (SNR), which can interfere with the three-dimensional reconstruction.