Computed tomography physics pdf notes

A tomographic image is an image of a slice through the body. Choose from 500 different sets of computed tomography flashcards on quizlet. This new technique of computed tomography ct reconstructs a crosssectional image of the body from a virtual pile of xray photographs. The central section theorem projectionslice theorem perhaps the most important theorem in computed tomography is the central section theorem, which says. Links, medical imaging signals and systems, and lecture notes by prince. It generates a computer coding of a digital representation of an area of interest through a patient, a structure or an object. Note that the sampling of the 2d fourier space is denser around the. Physical principles and biohazards michael sandborg department of radiation physics faculty of health sciences linkoping university, sweden. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Computed tomography ct, sometimes called computerized tomography or computed axial tomography cat, is a noninvasive medical examination or procedure that uses specialized x. A basic description of the mechanism of ct computed tomography scans for medical use in remote sensing. Physics of x ray imaging cr, dr, fluoroscopy duration. Basically, a narrow beam of x ray scans across a patient in synchrony with a radiation detector on the opposite side of the patient. Since computed tomography ct has entered the industrial environment around thirty year ago.

Note that z is the axis of rotation which coincides with the zaxis. Computed tomography, more commonly known as a ct or cat scan, is a diagnostic medical imaging. Values are number of sections times section width millimeters. Therefore bremsstrahlung xrays can have a range of energies from 0 up to a maximum equal to the energy of the projectile electrons. From the aapmrsna physics tutorial at the 2001 rsna scientific assembly. Basic principles of computed tomography univerzita karlova. Physics of computed tomography i ct easy radiology. For this reason, ct is sometimes called computed axial tomography cat, although the. Basic principles of ct scanners and image reconstruction indico. Quizlet flashcards, activities and games help you improve your grades. Thanks to the big ct community for all the information. Rdxdy this collection of projections g qr is known as the radon transform of fx,y. Introduction to computed tomography study guide by reakins includes 20 questions covering vocabulary, terms and more. Pdf mathematics and physics of computed tomography ct.

Tomographic imaging, ieee press, 1988 a free pdf copy is available at. Using specialized equipment and expertise to create and interpret ct scans of. Lecture notebasic principles of xray computed tomography. The tomography thus provides a virtual representation of reality, in the intimacy of its composition. Learn computed tomography with free interactive flashcards. Note that the imaged slice is perpendicular to the long axis of the body. Introduction to computed tomography flashcards quizlet. Clinical computed tomography ct was introduced in 1971 limited to axial imaging of the brain in neuroradiology it developed into a versatile 3d whole body imaging modality for a wide range of applications in for example. Thus the maximum possible xray energy in ev is numerically equal to the acceleratingelectricpotential,e. Computed tomography part i yao wang polytechnic university, brooklyn, ny 11201 based on j.