IBN KHALDUN University College MCQ Tomography Equipment PDF 2023-2024

Ministry of Higher Education ‫وزارة التعليم العالي والبحث العلمي‬ and Scientific Research ‫كــــــــلية ابن خلدون الجامــــــعة‬ Ibn khaldun University College...

Ministry of Higher Education ‫وزارة التعليم العالي والبحث العلمي‬ and Scientific Research ‫كــــــــلية ابن خلدون الجامــــــعة‬ Ibn khaldun University College ‫ تقنيات األشعة والسونار‬: ‫القسم‬ Stage: : second stage ‫ الثانية‬:‫المرحلة‬ Subject: Computed ‫ تقنيات اجهزة التصويرالمقطعي‬:‫المادة‬ Tomography Equipment ‫المحوسب‬ techniques ‫الوقت‬ Time: 2 h. 2023-2024 MCQ Tomography Equipment ‫ فصلي‬/ ‫النظام كورسات‬ techniques 36- In an ionization chamber used for radiation detection, if insufficient voltage is applied to the electrodes a) ions do not properly adhere to electrode b) no current flows in the circuit c) radiation will not ionize the gas d) ions created will recombine prior to reaching the electrodes e) none of the above 37-The negative electrode of an x-ray tube is always called the------------------------ a) filament b) anode c) grid d) cathode e) neutral 38- The focal spot of the x-ray tube is located a) at the filament b) at the cathode c) at the anode d) midway between the anode and cathode e) Parallel to cathode 39- The reason the focal spot of the x-ray tube is kept small is to a) reduce heat generated b) increase x-ray energy c) limit the degree of image penumbra d) obtain monochromatic radiation e) radiation will not ionize the gas 40- Most sensitive test for metastatic deposit is a- Isotope scan b- CT Scan c- Skeletal survey d- Tomography e- X-ray scan. 41- Diagnosis of aortic calcification is done by fluoroscopy by seeing a- Side to side movement b- Up and down movement c- Combined movement d- None e- side only 42- What is the principal disadvantage of third generation CT scanners? a- ring artifacts b- slow speed c- poor reconstruction d- patient dose e- fast speed 43- The reduction in _____ was the principal advantage of the second-generation CT scanners. a-image noise b-scatter radiation d- scanning time d- patient dose e- absorption radiation Ministry of Higher Education ‫وزارة التعليم العالي والبحث العلمي‬ and Scientific Research ‫كــــــــلية ابن خلدون الجامــــــعة‬ Ibn khaldun University College ‫ تقنيات األشعة والسونار‬: ‫القسم‬ Stage: : second stage ‫ الثانية‬:‫المرحلة‬ Subject: Computed ‫ تقنيات اجهزة التصويرالمقطعي‬:‫المادة‬ Tomography Equipment ‫المحوسب‬ techniques ‫الوقت‬ Time: 2 h. 2023-2024 MCQ Tomography Equipment ‫ فصلي‬/ ‫النظام كورسات‬ techniques 44- The first generation of computed tomography used _____ detector(s). a- two b-one c-three d –four e- five 45- Each pixel of information in the CT image contains numerical information in _____ units. a-Hounsfield b-reconstruction c-voxel d-pixel e-all of the above 46- Each sweep of the source-detector around the body during CT is called a _____. a-projection b-translation c-rotation d-reconstruction e- absorption 47- The new development in the fourth generation CT scanner is the _____. a-stationary detector array b-fan beam c- reduced patient dose d- ring artifacts e- detector array 48- Each CT projection records variations in _____. a-motion and noise b- density and contrast c-spatial resolution and contrast resolution d-mass density and effective atomic number e-contrast 49- CT scanners operate on _____ voltage generation. a- single-phase b- three phase c- twelve-pulse d-high frequency e-low frequency 50- The _____ generation of CT scanners was the first to have the fan beam transect the entire patient at all times. a- second b- third c- first d- fourth e- fifth 51-if each detector was 1.25 mm long and the scanner had 16 rows of detectors, the z axis coverage (slab thickness) per gantry rotation would total. a-10 mm b-30 mm c-20 mm d-15 mm e- 16 mm 52- If the x-ray beam is collimated to N active detectors in a multiple-row detector CT scanner, the relationship between beam pitch and collimator pitch is as follows: Ministry of Higher Education ‫وزارة التعليم العالي والبحث العلمي‬ and Scientific Research ‫كــــــــلية ابن خلدون الجامــــــعة‬ Ibn khaldun University College ‫ تقنيات األشعة والسونار‬: ‫القسم‬ Stage: : second stage ‫ الثانية‬:‫المرحلة‬ Subject: Computed ‫ تقنيات اجهزة التصويرالمقطعي‬:‫المادة‬ Tomography Equipment ‫المحوسب‬ techniques ‫الوقت‬ Time: 2 h. 2023-2024 MCQ Tomography Equipment ‫ فصلي‬/ ‫النظام كورسات‬ techniques a detector pitch – N b- detector pitch + N c- detector pitch / N d- detector pitch X N e- N / detector pitch 53- The Dual Source CT (DSCT) equipped with two data measurement systems, that it is possible to double the resolution compared with that of a single source CT, and-------- the speed of data acquisition a- increase b- decrease c- multiple d- constant e- infinity 54- With Dual Source mode- Each consisting of one X-ray tube and one corresponding detector array oriented in the gantry with an angular offset of -------- -- degrees. a- 180 b- 90 c- 360 d- 270 e- (-90) 55- The degree that a material will attenuate the X-ray beam is dependent on: (1) tissue composition and (2) photon energy level and how closely it exceeds the --------of the material. a- k- edge b- L-edge c- M-edge d- N-edge e- kl-edge 56- The purpose of the imaging system is a- to produce x rays b- Detect the radiation passing through the cross section c – measure d- - Convert the transmitted photons into digital information. e- All of the above. 57-The abbreviation of data acquisition system -------- converts this information into digital data. a- (DSS) b-(DAS) C- SDA d- SAD e- DVS 58- The Advantages of Straton x-ray tubes a- Better Heat Dissipation  b- Various size multiple focal spot  Ministry of Higher Education ‫وزارة التعليم العالي والبحث العلمي‬ and Scientific Research ‫كــــــــلية ابن خلدون الجامــــــعة‬ Ibn khaldun University College ‫ تقنيات األشعة والسونار‬: ‫القسم‬ Stage: : second stage ‫ الثانية‬:‫المرحلة‬ Subject: Computed ‫ تقنيات اجهزة التصويرالمقطعي‬:‫المادة‬ Tomography Equipment ‫المحوسب‬ techniques ‫الوقت‬ Time: 2 h. 2023-2024 MCQ Tomography Equipment ‫ فصلي‬/ ‫النظام كورسات‬ techniques c- Longer tube life  d- high-speed volume scanning is possible  e- All of the above. 59- Straton x-ray tubes Can be used in a- high KV and low mA technique b-low KV and high mA technique c- low KV and low mA technique d- high KV and low mA technique e- high KV and high mA technique 60-Thel purpose of filtration a- removes long-wavelength x rays b- produce uniform beam hardening c- attenuate the beam so that a more uniform (monochromatic) beam falls onto the detectors. d- Special shaped filters conform to the shape of the object and are positioned between the x-ray tube and the patient e -All of the above. 61- The Advantages of Straton x-ray tubes Can be used a- in high KV and high mA technique for prolonged Duration b- in high KV and low mA technique for prolonged Duration c- in low KV and high mA technique for prolonged Duration d- in low KV and low mA technique for prolonged Duration e- All of the above. 62- Straton x-ray tubes for increasing lengths of anatomic coverage a- High mAs & long exposure times b- High mAs & short exposure times c- low mAs & long exposure times d- low mAs &short exposure times e- All of the above 63- “bowtie” filter are usually made of Teflon which is: Ministry of Higher Education ‫وزارة التعليم العالي والبحث العلمي‬ and Scientific Research ‫كــــــــلية ابن خلدون الجامــــــعة‬ Ibn khaldun University College ‫ تقنيات األشعة والسونار‬: ‫القسم‬ Stage: : second stage ‫ الثانية‬:‫المرحلة‬ Subject: Computed ‫ تقنيات اجهزة التصويرالمقطعي‬:‫المادة‬ Tomography Equipment ‫المحوسب‬ techniques ‫الوقت‬ Time: 2 h. 2023-2024 MCQ Tomography Equipment ‫ فصلي‬/ ‫النظام كورسات‬ techniques a- a material that has a low atomic number and high density b- a material that has a low atomic number and low density c- a material that has a high atomic number and high density d- a material that has a low mass number and high density e- a material that has a low mass number and low density 64- Overbeaming “relates to x-ray beams being slightly wider than the detector which means a- that patients are exposed over a large area with the signal being detected”. b- that patients are exposed over a large area without the signal being detected”. c- that patients are exposed over a small area with the signal being detected”. d-that patients are exposed over a small area without the signal being detected”. e- that patients are not exposed over a small area with the signal being detected” 65- Overscanning “refers to exposure of the patient outside the imaged range which occurs for spiral CT with a- multi-row detectors at the start the scan”. b-single-row detectors at the start and the end of the scan”. c- multi-row detectors at the start and the end of the scan”. d- multi-row detectors at the end of the scan”. e- multi-row detectors at range end of the scan”. 66- The problems of overscanning and overbeaming can be solved using a technique called a- section collimation. b- adaptive section collimation c- adaptive section d- MSCT Scanning e- data acquisition system 67- CT detectors capture the radiation beam from the patient and convert it into Ministry of Higher Education ‫وزارة التعليم العالي والبحث العلمي‬ and Scientific Research ‫كــــــــلية ابن خلدون الجامــــــعة‬ Ibn khaldun University College ‫ تقنيات األشعة والسونار‬: ‫القسم‬ Stage: : second stage ‫ الثانية‬:‫المرحلة‬ Subject: Computed ‫ تقنيات اجهزة التصويرالمقطعي‬:‫المادة‬ Tomography Equipment ‫المحوسب‬ techniques ‫الوقت‬ Time: 2 h. 2023-2024 MCQ Tomography Equipment ‫ فصلي‬/ ‫النظام كورسات‬ techniques a- electrical signals b- mechanical signals c- US signals d- magnetic signals e- voices signals 68- Absorption efficiency refers to the number of photons absorbed by the detector and depends on a- the atomic number b- physical density c-, size,d- thickness of the detector face. e- All of the above 69- Conversion efficiency refers to the ability to accurately a- convert the transmitted x-ray signal into an electrical signal. b- convert the absorbed x-ray signal into a mechanical signal. c- convert the absorbed x-ray signal into an electrical signal. d- convert the absorbed x-ray signal into an US signal. e- convert the absorbed x-ray signal into an magnetic signal. 70 - Efficiency refers to the ability to, ---------,---------- and convert x-ray photons to electrical signals. a- capture, scattered b- capture, absorb c- capture, transmitted d- scattered, transmitted e- All of the above 71- the speed with which the detector can detect an x-ray event and recover to detect another event a- Efficiency b- Response time c- Conversion efficiency d- capture efficiency e- All of the above 72- Scintillation detectors (luminescent materials) convert a- x-ray energy into light, after which the light is converted into electrical energy by a photodetector b- x-ray energy into light, before which the light is converted into electrical energy by a photodetector