What are axial images?

radiology A view obtained by rotating around the axis of the body, producing a transverse planar image, i.e., a section transverse to the axis.

What is CT image quality?

CT image quality, as in most imaging, is described in terms of contrast, spatial resolution, image noise, and artifacts.

What is an interval CT scan?

Slice Interval This is the distance between the centre of two adjacent slices, and it ultimately determines the number of images in a series. You can select one of three slice interval settings: 1) Contiguous: Interval = Thickness. So where one slice ends, the next one starts.

Are CT scans reversed?

Mirror-image reversal of coronal computed tomography (CT) scans does occur and can lead to inappropriate medical care and wrong-sided surgery. The symmetrical anatomy of the head and neck can make identification of mirror-image reversal labeling of CT scans difficult to identify.

What does axial mean in CT scan?

The “cuts”(tomograms) for the CAT scan are usually made 5 or 10 mm apart. The CAT machine rotates 180 degrees around the patient’s body; hence, the term “axial.” The machine sends out a thin X-ray beam at 160 different points.

What is CT artifact?

In computed tomography (CT), the term artifact is applied to any systematic discrepancy between the CT numbers in the reconstructed image and the true attenuation coefficients of the object.

What is Z sensitivity in CT?

Z-sensitivity refers to the effective imaged slice width.

What is interpolation in CT?

Interpolation. Interpolation is a mathematical process used to smooth, enlarge or average images that are being displayed with more pixels than that for which they were originally reconstructed.

What affects image quality in CT?

Factors influencing contrast: Noise: a higher noise will obscure any contrast between objects. Tube current: a higher tube current reduces the noise in the image. Inherent tissue properties: the difference in the linear attenuation coefficient of adjacent imaged objects will determine the contrast between those objects.

What is the difference between SFOV and DFOV?

DFOV: Display field of view– determines how much of the scan field of view is reconstructed into an image. DFOV can be less than or equal to the SFOV but cannot be more than the SFOV. High contrast resolution: The ability to distinguish sharp edges between small objects that differ greatly in density.

What is axial image in radiology?

axial image. ax·i·al im·age. (ak’sē-ăl im’ăj) radiology A view obtained by rotating around the axis of the body, producing a transverse planar image, i.e., a section transverse to the axis.

What does contiguous mean in a CT scan?

The word contiguous simply means that images were obtained without interruption throughout the area examined by the scanner. The first CT scans worked by taking axial (like bologna slices) images of the head or body (Computerized Axial Tomography scans – hence CAT scans).

What are the advantages and disadvantages of axial scanning?

If the axial scanning has some benefits on producing high quality images. Inversely, axial scanning has also disadvantage on providing CT scan images. The primary disadvantage to the axial method is that the cumulative effect of the pauses between each data acquisition adds to the total examination time.

Why is the real image formed on the x-axis?

So a real image is only formed when rays from different points on the object meet each other (converge). Since rays are only converged by a concave mirror or a convex lens towards their center, rays can only meet below the X-axis if the object is above the X-axis, hence real image is formed inverted in all planes with respect to the object.