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Week 4 assignment

QuestionAnswer
1). Spatial Resolution The ability of an imaging system to be able to clearly show small details in high contrast, for example, a calcification.
2). Modulation Transfer function how well an imaging system shows fine details or contrast from the object to the image.
3). Contrast resolution The ability to distinguish the many shades of grey between black and white.
4). Dynamic Range The number of shades of gray that an imaging system is able to reproduce.
5). Charged-Coupling Device (CCD) The light sensing part of most digital cameras that has three advantageous characteristics in image processing: Sensitivity, Dynamic range and size
6). First form of Digital radiography -Computed Radiography was introduced by Fuji in 1981 after the shift from analog screen-film radiography. -CR reduced processing steps, lowered patient dose, and paved the way for more modern digital systems such as DR.
7). Radiation Quantity (mAs) Number of X-Rays in an X-ray beam (How many X-rays are produced)
8). Radiation Quality (kVp) The energy if the x-ray beam (Strength of the x-rays)
9). Autotransformer Designed to deliver a precise amount of voltage to the filament & high-voltage circuit of the x-ray imaging system
10). Thermionic Emission When the heated filament releases electrons.
11). AEC Measures the quantity of radiation that hits the image receptor and terminates exposure when the receptor receives the required amount of radiation.
12). Full-wave rectification Cuts exposure time for any technique in half.
13).Heel effect The variation in x-ray beam intensity where radiation is stronger on the cathode side and weaker on the anode side because x-rays on the anode side pass through more material
14). Cathode Negative side of x-ray tube. Contains the filament s and boils off electrons through thermionic emission and contains a focusing cup that directs those electrons towards the anode (positive side)
15). Anode Positive side of hte x-ray tube that targets electrons hit to make x-rays. Most machines containe a rotating anode that spins off heat better.
Created by: Lozano34
 



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