What is x ray attenuation - Study guides, Class notes & Summaries

CT Registry Review (MIC) Questions and Answers 100% Pass In order for an x-ray photon to be measured it must: 1. enter the detector chamber 2. be absorbed by the detector material 3. be converted to a measurable event - Correct Answer ️️ -1,2,3 Which system component converts the projection attenuation data into the proper digital form for the array processor? - Correct Answer ️️ -analog-to-digital converter Which of the following is NOT a function of a PACS system? a. reconstru...

Test Bank For Radiation Protection in Medical Radiography 9th Edition by Sherer | Chapter 1-14 | Complete 2023. Chapter 01: Introduction to Radiation Protection Sherer: Radiation Protection in Medical Radiography, 9th Edition MULTIPLE CHOICE 1. Consequences of ionization in human cells include 1. creation of unstable atoms. 2. production of free electrons. 3. creation of highly reactive free radicals capable of producing substances poisonous to the cell. 4. creation of new biologic mole...

Coulter principle. - Answer-The ability to count and measure the size of particles using an electric circuit. Particles are moved through a small aperture, their presence causes a narrowing of the aperture, which leads to an increase in resistance.By using constant I, According to Ohms law (U= I * R), when R increases, U increases and pulse is generated. Parts and functions of the Coulter-counter - Answer-- Two spaces with a small aperture in between, capillary (contains the electrolyte sol...

What is a specialized x-ray procedure that involves the measurement of x-ray attenuation passing through a given part of human anatomy called? correct answers Computed Tomography (CT) What measures the non-absorbed x-rays that pass through anatomical structure and send this information to a computer for reconstruction called? correct answers Radiation Detectors What involves using mathematical equations (algorithms) to create an image of a specific section of the body for display on a cath...

Attenuation: a. is radiation that emerges from the patient b. describes changes in the x-ray beam as it travels through the patient c. produces only scatter radiation d. occurs only at doses used in radiation therapy - Describes changes in the x-ray beam as it travels through the patient Which photon-tissue interaction makes radiography possible because of its creation of image contrast? a. Compton b. Coherent c. Photoelectric d. Pair production - Photoelectric Which photon-tis...

Ionizing Radiation - radiation that is able to remove electrons from an atom through ionization Somatic effects - refers to the effects of radiation to the body being irradiated Genetic Effects - refers to effects of radiation to a germ cell's genetic code; effects the next generation Primary radiation - radiation exiting the x-ray tube Remnant radiation (or Exit Radiation) - x-rays the leave the patient and strike the image receptor attenuation - absorption and scatter of the x-...

Fluoroscopy Exam Test Bank Questions with 100% Correct Answers What activates the production of x-rays during fluoro? - Answer- Dead man switch (foot switch); NOT THE "FOOT PEDAL"! How many light photons are emitted for each absorbed x-ray photon? - Answer- 5000 light photons. What percentage of light from an image intesifier's output screen is transmitted to the cine camera when in use? - Answer- 85 - 95%. Which type of timer accuracy test is performed for three phase x-ray unit...

what mag modes are available? - Answer if you have a 16" II, you can have 12,9,6, and 4.5 " Compton effect - Answer hits the outer electron, incomplete transfer of energy, electron released and a low energy xray is deflected photoelectric absorption - Answer x-ray totally absorbed by inner shell electron, x-ray overcomes binding energy and knock out the electron and an outer shell electron takes it place. When the outer electron moves to its new place, a characteristic x-ray is for...

Absorbed dose the amount of energy absorbed per unit mass (grays or rads) back projection - 3rd step in IR loop of iterative reconstruction algorithm - ray sum data are projected back onto a matrix. blood urea nitrogen (BUN) renal function (nitrogen in blood) (7-25mg/dl) bow-tie filter Filter compensating for a cylindrical shape (body) -filter is thicker at the ends contiguous images images with equal section thicknesses & reconstruction intervals Alia...

The general process of CT imaging may be divided into what 4 steps? correct answers 1) data acquisition 2) data reconstruction 3) multidimensional image display 4) image archival and communication The measurement of the attenuation that occurs along each path through the patient from x-ray tube to detector correct answers Data acquisition The computerized processing of the transmission measurements into the CT image correct answers Data reconstruction Display of the reconstructed gra...