Diagnostic Radiography Assignment

Added on - 28 May 2020

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Running head: DIAGNOSTIC RADIOGRAPHYDIAGNOSTIC RADIOGRAPHYName of the StudentName of the UniversityAuthor Notes
1DIAGNOSTIC RADIOGRAPHYTable of ContentsSection A.........................................................................................................................................2Answer 1 a...................................................................................................................................2Answer 1 b...................................................................................................................................5Section B..........................................................................................................................................7Answer 5......................................................................................................................................7Answer 6 a.................................................................................................................................10Answer 6 b.................................................................................................................................10Answer 6 c.................................................................................................................................11Answer 6 d.................................................................................................................................11Reference List................................................................................................................................14
2DIAGNOSTIC RADIOGRAPHYSection AAnswer 1 aComputed Tomography (CT) scanning is also designated computerized axial tomography(CAT) scanning. Tomography is a culmination of 2 Greek words, ‘tomos’, which means sliceand ‘graphia’, which means image (Faraj 2013). It was invented by Godfrey Hounsfield of EMIlaboratories in 1972 and also by Allan Cormack of Tufts university in Massachusetts. Initiallythe system was used for head imaging but in 1976, whole body imaging was available.Computed Tomography generates cross-sectional images with the help of X- rays and computers(Smith 2016). This diagnostic imaging technique uses X-rays to produce cross-sectional imagesof the human body. The resulting attenuation co-efficient of the X-rays are used to reconstructthe cross-sections.The first manufactured CT scanner was not that much effective in terms ofspeed and resolution. The first CT scanner developed by Hounsfield took days to acquire rawdata and reconstruct image from it. However, the scanning time became faster with time,research and development. Improvement in speed and resolution can be understood from the factthat current CT scanner can collect data in 350 m (Seeram 2015).The important component of the CT includes Gantry, X-ray tube, control console and thegas filled detector. The gantry is the largest unit of the scanner that contains x-ray tube, gas filleddetectors, patient support couch and mechanical support components. Hence, the gantry containsall the components that are necessary to produce a CT image. The x-ray tube and detectors areplaced opposite to each other and gantry is the main centripetal forces that help in the rotation ofthe x-ray tube and the detectors. Both the x-ray tube and detectors helps in generation anddetection of x-rays The factor that has increased the temporal resolution and imaging speed of
3DIAGNOSTIC RADIOGRAPHYthe CT includes modifications in the rotation speed of the CT gantry since the first developmentof CT. Hence, improvement in scan time enhanced the time taken to collect data. Anotheradvancement seen with introduction of advanced scanning technology was the increase innumber of slices. Gas filled detectors has also been replaced with solid state detectors now (Pelc2014).Figure 1: Components of a CT scanner (It shows important components of scanner that plays arole in generation of image). Source: (Hsieh 2009)The basic principle of computed tomography is based on the fact that the X-ray beamsthat pass through the tissue can be used to calculate the density of the tissue (Wehling 2015). Thedensity of the tissue can be determined by calculating the attenuation co-efficient of the X-raybeams. Computed tomography generated beams of kilo voltage photons that are passed through aparticular volume of tissue from various different angles. On the opposite end is a dosimeter thatcaptures the incoming ionizing radiations and carries out the necessary measurements. This helps
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