![]() ![]() For example, in this image, the liver is found on the left side of the image, but anatomically it is located on the right. Let’s face it, we don’t think about people in slices, and the anatomic right and left are reversed on the image. The axial plane is the one that radiologists use the most, but it is not the most intuitive. The axial plane can be thought of as slices through the patient Axial plane Once the patient images are obtained, they are reconstructed first in the axial plane, which reflects how the images were taken. This extra information is used to create 3-dimensional images which allow you to scroll through the body slice by slice and see very detailed anatomy. This provides information about how the body blocks x-rays from every angle. For instance, in an abdominopelvic CT, the scout image is used to plan the scan from a few cm above the bottom of the lung to just below the pubic symphysis.ĭuring a CT scan, the tube and detectors spin very quickly around the patient while continuously taking pictures as the patient passes through the scanner. Air-filled structures like the lungs or bowel look darker because they do not block many x-rays at all.Ī CT scan starts by taking an image similar to an x-ray called the scout or localizer image. Dense structures like bone block x-rays and look bright or white on the images. ![]() The x-ray detector records how the x-rays are blocked by structures in the body, and this is used to generate the image. The process is similar to taking a picture with a camera, with the obvious difference that the x-ray camera allows you to see what is under the skin. Unlike a CT scanner which can be manipulated to view images in multiple planes, an x-ray can only capture an image in a single plane. X-rays are obtained with the patient in between the x-ray generator and the x-ray detector. Firstly, we review of why Computer tomography (CT) is different from X-ray, and then cover Computed Tomography planes.
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