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Cone beam computed tomography (or CBCT, also referred to as C-arm CT, cone beam volume CT, flat panel CT or Digital Volume Tomography (DVT)) is a medical imaging technique consisting of X-ray computed tomography where the X-rays are divergent, forming a cone.
Cone-beam computed tomography (CBCT) based image guided systems have been integrated with medical linear accelerators to great success. With improvements in flat-panel technology, CBCT has been able to provide volumetric imaging, and allows for radiographic or fluoroscopic monitoring throughout the treatment process.
The 2021 U.S. Preventive Services Task Force guidelines recommend annual screening for lung cancer with low-dose computed tomography in adults aged 50 to 80 years who have a 20 pack-year smoking history and currently smoke or have quit within the past 15 years. [6]
The distance the table moves for every 360° rotation of the X-ray generator is called the increment or table feed for axial scan modes. For helical scan modes, it is called table speed. [3] Setting an increment that is smaller than the slice thickness results in overlap between the slices.
The following table shows the preferable volume in normal weight adults. However, dosages may need to be adjusted or even withheld in patients with risks of iodinated contrast , such as hypersensitivity reactions, contrast-induced nephropathy , effects on thyroid function or adverse drug interactions .
Even though the actual scan may be completed in 1 second or less, considerable staff and patient time is required for preparation of the contrast agent, positioning on the scanner and planning the scan. This is particularly the case, as patients undergoing CTPA are frequently seriously unwell requiring oxygen treatment and/or close monitoring.
Insurance companies determine what drugs are covered based on price, availability, and therapeutic equivalents. The list of drugs that an insurance program agrees to cover is called a formulary. [7] Additionally, some prescriptions drugs may require a prior authorization [88] before an insurance program agrees to cover its cost.
A coronary CT calcium scan is a computed tomography (CT) scan of the heart for the assessment of severity of coronary artery disease. Specifically, it looks for calcium deposits in atherosclerotic plaques in the coronary arteries that can narrow arteries and increase the risk of heart attack. [ 1 ]