'Contrast resolution' diaporamas de présentation

Seeram Chapter 11: Image Quality

CT. Seeram Chapter 11: Image Quality. CT Image Quality Parameters. Spatial Resolution. Contrast Resolution. Image Noise. Artifacts. Factors Influencing CT Image Quality. Beam Characteristics. Subject Transmissivity. Dose. Slice Thickness. Scatter. Display Resolution.

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Image Processing

Image Processing. The common tasks addressed by imaging informatics can be roughly classified as image generation is the process of generating the images and converting them to digital form if they are not intrinsically digital.

651 views • 55 slides

CT Image Quality & Quality Control

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Ct image quality

Ct image quality. CT examination quality parameters. A. Technique Parameters B. Anatomic Coverage/Display C. Filming Technique (for hard copy film submissions only) D. Artifacts E. Examination Identification: Missing Information F. Examination Protocols. A. Technique Parameters

1.34k views • 44 slides

Example of Aliasing

Example of Aliasing. Sampling and Aliasing in Digital Images. Array of detector elements Sampling (pixel) pitch Detector aperture width The spacing between samples determines the highest frequency that can be imaged Nyquist frequency: F N = 1/2 D

482 views • 35 slides

Image Quality

Image Quality. Bushong Chapter 7. Image Quality. Image quality can be described by five characteristics Contrast resolution Spatial resolution Image noise Linearity/Distortion Uniformity/Artifacts. What influences image quality?. X-ray beam characteristics Dose

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Basic Abdominal and Pelvic Imaging Concepts

David L. Smith, MD Assistant Professor of Radiology. Basic Abdominal and Pelvic Imaging Concepts. C o n t r a s t R e s o l u t i o n vs Spacial Resolution. Basic Imaging Concepts. ... refers to the ability of the imaging modality to differentiate two closely-approximated objects .

708 views • 32 slides

Visual Perception Process

Visual Perception Process. Depend on visual limitation of observer & their mental process Low radiation exposure low S/N Low response of eye & brain. Cone receptors rod receptors 6-7 millions 75-150 millions

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Unsharpness Calculations and Resolution

Unsharpness Calculations and Resolution. By Professor Stelmark. Source-to-object distance (SOD) refers to the distance from the x-ray source (focal spot) to the object being radiographed. SOD can be expressed mathematically as follows:.

374 views • 20 slides

?????? (Resolution) ?

?????? (Resolution) ?. ???. ???????????? ????? (spatial resolution) ????? (contrast resolution) ????? (temporal resolution). ?????. ????. ??????. ????. Output. Input. LTI System. ???. Impulse. LTI circuit. Impulse Response. ??. Point. LTI System. Point Spread Function.

508 views • 9 slides