# Unit 8 - Spacial Resolution & Detail

 .remove_background_ad { border: 1px solid #555555; padding: .75em; margin: .75em; background-color: #e7e7e7; } .rmbg_image { max-height: 80px; } ________ is the degree of geometric sharpness of the structural lines recorded on an image - Definition - Sharpness - Resolution Recorded Detail _______ is a term applied to a digital image recorded as: - The ability of an imaging system to accurately display objects in 2 dimensions Spacial Resolution Recorded Detail Vs. Visibility of Detail - ________ is a geometric property that is not affected by the photographic properties of IR exposure & contrast Recorded Detail Assessing Recorded Detail - The recorded detail of an image can be assessed visually by evaluating the _____ of the anatomical structural lines. — Any image by size and/or shape will have ____ recorded detail  Recorded detail can also be assessed by using a resolution tool Sharpnessdecreased The spatial resolution of a digital imaging system is dependent on: ____ ____ ____ Matrix sizePixel sizeGrayscale bit depth Spacial resolution measures for digital imaging systems: ______ ______ ______ ______ Point spread function Spacial frequencyModulation transfer function (MTF)Noise Point Spread Function - Expresses the ____ of an image - Determined by complex mathematical measurement of an image produced by a single point - Relates to _____ or blur Boundary penumbra Spacial Frequency - Relates the number of ___ ___ in a given length - Determined by measuring the distance between pairs of lines from one another & then expressing them as cycles per unit of length (c/mm or c/cm) High frequency signal = _____ spacial resolution Low frequency signal = ______ spacial resolution Line pairshigherlower Modular Transfer Function (MTF) ____ measures the accuracy of an image compared to the original object on a scale of __ to __. - Determined by mathematically calculating the % of object contrast recorded. —— MTF of __ = imaging system produces an image that appears exactly as the object —— MTF of __= no signal nor image MTF, 0 to 1 10 ______ - refers to background information received by the IR - If significantly less than the amount of information coming from the IR, computer processing algorithms filter it out - Rising noise levels degrade the image —— ____ Noise - insufficient amount of photons reaching the IR results in blotchy or mottled image. NoiseQuantum noise Factors that Affect Recorded Detail - Controlling factors ____ ____ ____ Beam Geometry (SID, OID & Focal Spot Size)Image Receptor (digital systems)Motion (voluntary, involuntary & equipment) ____: distinct, sharp area seen within the center of an image ____: blurry, unsnarl area seen at the periphery (edges) of an image - negatively affects recorded detail UmbraPenumbra The size of the focal spot is controlled by the ____________ Line focus principle As focal spot size is increased, penumbra ____ & detail ____ As focal spot size is decreased, penumbra ____ & detail _____ Increases, decreasesdecreases, increases The relationship between SID & detail is ___: — As SID is increased, penumbra/size distortion (magnification) ____ & detail ____ DirectDecreases, Increases .remove_background_ad { border: 1px solid #555555; padding: .75em; margin: .75em; background-color: #e7e7e7; } .rmbg_image { max-height: 80px; } AuthorMarc817 ID349321 Card SetUnit 8 - Spacial Resolution & Detail DescriptionUnit 8 - Spacial Resolution & Detail Updated2019-11-02T18:57:39Z Show Answers