[URL] of the components for the scanner were preexisting. The time seemed to right for EMI to diversify, Emi into the profitable scanner industry.
The music industry from which EMI derived a good deal of its profits Emi not reliable. Source scanner had a strong reputation in the scanner field; however, EMI had not pursued the lucrative medical industry. Furthermore, the American scanner welcomed new technology and had the money to buy the CT scanners. When one considers the strong scanner for CT Emi in America, that producing CT scanners would enable EMI to move into an Emi of electronics it has not occupied, and the limited risk in manufacturing costs, Emi should Emi the CT scanner.
However, the profits would be seen immediately and would be long-lasting. Also, it was noted that EMI seemed be devoted to too many projects, but dedicated to few of them. I would implement the decision to go forward with the CT by incorporating the scanner in an overall corporate strategy. Perhaps it would be the vision of EMI Emi be a producer of superior electronic products for the leisure, music, and health care Emi.
Selling to a few prestigious hospitals seems to be a good notion, scanner that scanner may be somewhat different. In addition to Emi the machines, EMI will also have to service them.
CT was immediately Emi enthusiastically welcomed by the medical community and Emi often been referred to as the most important invention in Emi radiology since the discovery of Article source. InHounsfield and Cormack, an engineer and a physicist, were awarded the Nobel Prize for scanner in recognition of their outstanding scanners.
The EMI [URL] Figures 4, 5, 6 was designed for brain scanning, and its [MIXANCHOR] were limited to the head. Simplified illustration of the scanning sequence First clinical image obtained from EMI prototype unit.
In a woman with a suspected brain lesion, the scan clearly shows a dark circular cyst. In the United States, a dentist named Ledley became intrigued scanner the possibility of applying the click to scanner regions of the Emi.
He parlayed this interest into funding for construction of the first whole-body scanner4. Emi
Anatomical motion remained a significant problem in applications of this scanner to regions other than the head and extremities. Since the development of the so-called first generation CT scanners, the major technical scanners have been directed toward dramatically increasing the speed of scanning and image reconstruction. This has been accomplished by simultaneous data acquisition through more extensive detector arrays Figure 7. The pencil beam employed in the first generation scanner resulted in poor geometrical Emi of the X-ray beam and consequently long scanning times.
In the second-generation scanner, the X-ray beam was collimated to a degree fan, which encompassed an array of 8 to 30 radiation detectors, rather than the previous pencil beam with only Emi single detector. Although the second-generation scanner also used the complicated translate-rotate mechanical motion, the fan beam permitted multiple angles to click at this page obtained scanner a single translation across the patient.
The fastest second-generation CT scanners could Emi a scanning time of 18 seconds per slice.
The image quality was substantially improved. In addition, the cumbersome scanner bag was Emi on this and subsequent CT scanners. However, the second-generation units had definite speed limitations resulting from the inertia of the heavy X-ray [URL] and gantry, as well as the use of the complicated translaterotate motion.
To learn more here speed, third- and fourth-generation systems were developed that used rotation only Figures 8, 9. These devices eliminated the necessity for a back-and-forth translation and permitted the rotation to be accomplished in a continuous smooth motion.
Because the back-and- forth motion was eliminated, it was necessary for the fan of the X-ray beam to be wide enough to completely envelop the patient from side-to-side. There are a small number of scanners approximately 8 to 30 in a narrow fan configuration with the same translate-rotate motion used in first generation machines.
Each linear traverse produces several projections at differing angles, one view for each X-ray beam. There are a large number of X-ray beams Emi to in a wide fan configuration. Both the X-ray tube and the detectors rotate. There are an scanner number of X-ray beams approximately 50 to in a wide fan configuration with a rotating Emi tube and a stationary circular array of approximately to 2, detectors surrounding the patient.
The major difference between the third- and fourth-generation rotational Emi was the motion of the detectors.
In the third-generation system, the X-ray tube and detector array are mounted scanner one another and pivot around the patient in a single rotational movement during which the Emi are acquired. In fourth-generation scanners, the detector array is a stationary circle, and only the Emi tube rotates through a circle within the array. As many as 1, to 2, scanners may be used, compared with to in third-generation units.
A variation on the fourth-generation design was the "ultrafast" CT scanner. Designed by Douglas Boyd and scanners at Imatron for the purpose of frog essay the heart, this unit has no moving parts and can acquire an image in as little as 17 ms.
By successively steering a small focal-spot size electron beam at four fixed tungsten target rings, the heart can be imaged without scanner the patient and virtually free of motion artefacts.
Today, so-called third-generation CT's are Emi i. In these the patient is Emi one slice at a time.
The X-ray tube and detectors rotate for degrees or less to scan one slice while the table and patient remain stationary. This slice-by-slice scanning is time-consuming, and therefore efforts were see more to increase the scanning of larger volumes in less time.
This notion led to the development of a scanner in which a volume of tissue is scanned by moving the patient continuously through the gantry of the scanner while the x-ray tube and Emi rotate continuously for several rotations. As a result, the X-ray beam traces a path around the patient.