Radiographic Image Acquisition and Evaluation
Final Exam
Course Introduction
Radiographic Image Acquisition and Evaluation provides students with a comprehensive understanding of the principles and techniques involved in capturing high-quality diagnostic radiographic images. The course explores factors affecting image quality, such as exposure parameters, patient positioning, equipment operation, and digital imaging technologies. Emphasis is placed on the evaluation of images for diagnostic accuracy, recognizing common artifacts and errors, and implementing corrective measures. Students will learn to apply standardized protocols to ensure consistency and safety in clinical settings, as well as develop critical thinking skills for troubleshooting and optimizing image quality within various radiographic procedures.
Recommended Textbook
Digital Radiography An Introduction for Technologists 1st Edition by Euclid Seeram
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500 Verified Questions
500 Flashcards
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Chapter 1: Digital Radiography: An Overview
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Sample Questions
Q1) Which of the following is one important objective descriptor of digital image quality?
A) DQE
B) PMT
C) CCD
D) IP
Answer: A
Q2) An important element of image and data communications is that of ____________________.
Answer: image compression
Q3) As a display medium, the optical range and contrast for film are ____________________ and limited.
Answer: fixed
Q4) Film-screen radiography has been the workhorse of radiology ever since the discovery of X-ray by W.C.Roentgen in 1895.
A)True
B)False
Answer: True
Q5) Film-based imaging is limited in its ____________________. Answer: contrast resolution
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Chapter 2: Digital Imaging Processing Concepts
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Sample Questions
Q1) A digital image is made up of numbers; by definition, the range of the numbers is the ____ and the center of the range is defined as the ____.
A) LUT; WW
B) WW; WL
C) WL; WW
D) LUT; WL
Answer: B
Q2) The pixels that make up the matrix are generally ____.
A) horizontal
B) rectangular
C) square
D) vertical
Answer: C
Q3) The term ___________________ implies that all the pixels in the entire input image are used to change the value of a pixel in the output image.
Answer: global
Q4) The third step in digitizing an image is ____________________.
Answer: quantization
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Chapter 3: Computed Radiography: Physics and Technology
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Sample Questions
Q1) The maintenance of equipment is an integral part of the daily activities in _____________________ since it is considered a component of a continuous quality improvement program.
Answer: radiology
Q2) The ____________________ allows the technologist to do any post-processing on images before they are communicated to the PACS for storage.
Answer: workstation
Q3) Quality control (QC)is a component of QA and refers specifically to the ___________________ of important variables that affect image quality and radiation dose.
Answer: monitoring
Q4) The ____________________, or scanner, is a machine for scanning the exposed IP to render the latent image visible.
Answer: CR reader
Q5) In general, the greater the bit ____________________, the better the density resolution of the image.
Answer: depth
Q6) Some IPs have a(n)____________________ for easy identification.
Answer: barcode
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Chapter 4: Effective Use of Computed Radiography
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Sample Questions
Q1) Since the grid strips are oriented in the direction of grid tilt, grid cutoff is more likely to occur.
A)True
B)False
Q2) Because of the increased sensitivity to scattered radiation, the kVp should not exceed ____ for any nongrid radiography, including chest.
A) 20
B) 40
C) 60
D) 80
Q3) ____ are much more susceptible to fogging than are conventional film-screen systems.
A) PSP plates
B) image plates
C) IP plates
D) plate margins
Q4) Because of the wide dynamic range of the PSP plate and automatic rescaling, the relationship between exposure and image brightness is ____________________.
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Page 6
Chapter 5: Flat-Panel Digital Radiography
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Sample Questions
Q1) Which of the following is a photoconductor that conducts electrons when struck by light or X-ray photons?
A) selenium
B) cesium iodide
C) amorphous silicon
D) photodiode
Q2) An important imaging performance characteristic of a flat-panel detector that has an impact on clinical practice is image lag.
A)True
B)False
Q3) Which layer used in the indirect flat-panel digital detector is usually either cesium iodide (CsI)or gradolinium oxysulfide (Gd?O?S)?
A) flat panel
B) thin-film transistor
C) X-ray scintillator
D) amorphous silicon
Q4) In imaging, the goal is to obtain good ____________________ information in the image.
Q5) The narrower the LSF, the better the ____________________ resolution.
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Chapter 6: Digital Fluoroscopy
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Sample Questions
Q1) ____________________ subtraction involves the digital subtraction of images in time.
Q2) In digital fluoroscopy, the display image receives the video signal from the video camera and with suitable electronics, uses the signal to create the television image.
A)True
B)False
Q3) ____ refers to the brightening of the fluoroscopic image using the image intensifier.
A) Pulsed fluoroscopy
B) Conventional fluoroscopy
C) Magnification
D) Image intensification
Q4) Recently, 43 cm x 43 cm dynamic FPD has become available for digital fluoroscopy; however, it is still not available for digital radiography.
A)True
B)False
Q5) In the case of ____________________ scanning, 262.5 odd lines (one TV field)are first scanned, followed by 262.5 even lines (one TV field).
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Chapter 7: Digital Mammography
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Sample Questions
Q1) Digital mammography can be used in visualizing ____ by using an iodinated contrast medium.
A) lesions
B) density
C) angiogenesis
D) tomosynthesis
Q2) Digital mammography (DM)is radiography of the breast using a digital detector coupled to a computer that makes use of digital image processing techniques to enhance the visibility of detail and contrast of the image.
A)True
B)False
Q3) The DQE for F-S mammography system is about ____%.
A) 25
B) 35
C) 45
D) 55
Q4) ____________________ finds unique features that can be readily distinguished reliably between a lesion and other normal anatomical structures.
Q5) The ____________________ is central to a DM imaging system.
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Chapter 8: Picture Archiving and Communication Systems
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Sample Questions
Q1) Some digital X-ray imaging modalities, as well as MRI, generate very large amounts of digital images that result in what has been referred to as a data explosion.
A)True
B)False
Q2) For the management and care of patients, PACS have been implemented largely in hospitals and clinics where health care and medical information are the primary focus.These systems can also be used for teaching and ____________________ purposes.
Q3) A(n)____ is a computer-based information system used to gather not only medical information about a patient but also all activities related to the hospital's administration, such as billing, accounting, statistics, personnel, budgets, and materials management, to mention only a few.
A) PACS
B) RIS
C) HIS
D) voice-recognition system
Q4) A(n)____________________ function is one that enables the user of the workstation to find the image or images to be reviewed.
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Page 10
Chapter 9: Medical Imaging Informatics: An Overview
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Q1) Which of the following is a secure, real-time, point-of-care, patient-centric information resource for physicians?
A) EHR
B) HIS
C) PACS
D) IT
Q2) ____ is a computer-based system for storing and transmitting images to remote locations for use by others involved in the medical management of the patient.
A) MII
B) DICOM
C) RIS
D) PACS
Q3) Digital devices must be able to communicate with each other regarding images and textual information, and this function requires the use of ____.
A) CT
B) IT
C) DF
D) DR
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Chapter 10: Quality Control for Digital Radiography
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Q1) The clinical ____________________ is responsible for equipment life cycle management and is therefore intimately involved in calibrations and service.
Q2) Because DR receptors are reused, ____________________ arising from receptor defects, dust and debris that interfere with the collection of light for CR and indirect DR systems, and contaminants such as barium contrast will show up on all subsequent images from that receptor until the problem is corrected.
Q3) When ____________________ in performance is observed, and corrective action is taken, it is important to verify that performance has returned to normal levels.
Q4) The value of the DR exposure indicator is usually visible at the QC ____________________.
Q5) The one test that can and should be done for every DR image is a(n)____________________ assessment of image quality before release.
Q6) ____________________ in DR causes an increase in quantum mottle and a loss of contrast in dense features.
Q7) Human errors tend to be systematic and predictable. A)True B)False
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