Dark-field computed tomography is an emerging medical imaging technology. While conventional CT measures differential attenuation properties of the various tissues, dark-field CT utilizes their small-angle scattering (dark field) characteristics.Apr 24, 2022.
What is the field of view for computed tomography?
A field of view (FOV) is the volume covered in an X-ray CT (computed tomography) scan image. An FOV can be either larger or smaller than the sample size..
What is the use of CT scan in medical field?
CT scans can be used to identify disease or injury within various regions of the body. For example, CT has become a useful screening tool for detecting possible tumors or lesions within the abdomen. A CT scan of the heart may be ordered when various types of heart disease or abnormalities are suspected..
What is tomography in the medical field?
Computed tomography is commonly referred to as a CT scan. A CT scan is a diagnostic imaging procedure that uses a combination of X-rays and computer technology to produce images of the inside of the body. It shows detailed images of any part of the body, including the bones, muscles, fat, organs and blood vessels..
A Computed Tomography (CT) scanner is an x-ray machine which combines many x-ray images with the aid of a computer to generate cross-sectional views and, if needed, three-dimensional images of the internal organs and structures of the body.
How did computed tomography work?
The earliest clinical computed tomography scanner had an X-ray source and a single detector (Fig
7 3a )
Data acquisition involved moving both tube and detector across the scanning plane to acquire a series of transmission measurements
Detector and tube were then rotated by 1° and the process repeated
What is computed tomography myelography (CTM)?
Computed tomography myelography (CTM) is a CT study made after the injection of iodinated contrast media into the subarachnoid space (Fig
2-22 )
CTM is most commonly performed in patients when there are contraindications for MRI, including implanted ferromagnetic biomedical devices or claustrophobia
The CT x-ray tube (typically with energy levels between 20 and 150 keV), emits N photons(monochromati…
Computed tomography field
Extent of the observable world seen at any given moment
The field of view (FOV) is the angular extent of the observable world that is seen at any given moment. In the case of optical instruments or sensors, it is a solid angle through which a detector is sensitive to electromagnetic radiation. It is further relevant in photography.
Flat-field correction
Digital imaging calibration technique
Flat-field correction (FFC) is a digital imaging technique to mitigate the image detector pixel-to-pixel sensitivity and distortions in the optical path. It is a standard calibration procedure in everything from personal digital cameras to large telescopes.
