CT scans are also known as computerized tomography or for short, CTs. Ct scans consist of a sequence of X-ray views taken from a variety of different positions that generate cross-sectional internal images of bones and soft tissues. A CT scan is particularly appropriate for promptly examining people who may have internal injuries from car accidents or other types of trauma. A CT scan can also visualize the brain and with the help of injected contrast material, check for blockages or other blood vessel irregularities.
In general, physicians order CT scans in order to:
* Diagnose muscle and bone disorders, such as bone tumors and fractures
* Pinpoint the location of a tumor, infection or blood clot
* Guide procedures such as surgery, biopsy and radiation therapy
* Detect and monitor diseases, such as cancer or heart disease
* Detect internal injuries and internal bleeding
Multi-detector CT is also a commonly used term. The extent of patient coverage by the detector rows currently ranges from 12mm to 160mm in length, depending on the CT scanner model.
CT scanner technology has advanced rapidly in recent years, moving to more efficient and stable detectors, more refined engineering and data acquisition systems and electronics, and faster computers.
These CT scanner developments have been largely directed towards faster scanning of further lengths of the patient, using finer slices. As a result, CT scanners have evolved from a slice-by-slice diagnostic imaging system into a truly volumetric imaging modality, where images can be reconstructed in any plane without loss of image quality. This has lead to the increased use of multi-planar and 3D display modes in diagnosis.
CT Scanner Gantry Basic Components.
The largest component of a CT scanner system is referred to as the scan or imaging system. The imaging system primarily includes the CT scanner gantry and patient table or couch. It is a moveable frame that contains the x-ray tube, including: collimators and filters, detectors, data acquisition system, rotational components including slip ring pharmacy no rx systems, and all associated electronics such as CT scanner gantry angulation motors and positioning laser lights. In older CT systems a small generator supplied power to the x-ray tube and the rotational components via cables for operation. This type of generator was mounted on the rotational component of the CT system and rotated with the x-ray tube. Some generators remain mounted inside the gantry wall. Some newer CT scanner designs utilize a generator that is located outside the CT scanner gantry. Slip ring technology eliminated the need for cables and allows continuous rotation of the gantry components. The inclusion of slip ring technology into a CT system scanner allows for continuous scanning without the interference of cables. It can be angled up to 30 degrees toward a forward or backward position. CT scanner gantry angulation is determined by the manufacturer and varies amount CT scanner systems. It allows the operator to align the applicable part of the body under examination with the scanning plane.