This LRA 221 Finals Review 2026/2027 is a comprehensive 15-page exam-preparation resource containing questions and correct answers on computed radiography (CR), digital radiography (DR), photostimulable phosphor (PSP) imaging, PACS, DICOM, digital image processing, image quality, flat-panel detectors, CCD and CMOS technology. The review begins by comparing conventional and computed radiography and covers storage phosphor plates, barium fluorohalide, focused laser stimulation, scintillators, photoconductors, dynamic range, look-up tables and PACS. It also distinguishes indirect DR conversion, which the document describes as converting absorbed x-ray energy into visible light, from direct conversion to an electrical signal. LRA 221 Finals Review 2026
A substantial section addresses digital image formation and image-quality principles. Students review matrix size, pixels, bit depth, exposure index, deviation index, brightness, contrast resolution, spatial resolution and detective quantum efficiency (DQE). The material also examines histograms, automatic rescaling, look-up table manipulation, edge enhancement, masking, smoothing, high-pass and low-pass filtering, window level, window width, veil glare, shuttering, image stitching, annotation and zoom. The review connects these concepts to practical factors such as focal spot, object-to-image distance, collimation, image sharpness, exposure and algorithm selection. LRA 221 Finals Review 2026
The PSP and computed-radiography section provides detailed coverage of imaging-plate construction and image acquisition. Topics include the active, color and reflective layers; aluminum backing; protection from static buildup and mechanical damage; barium fluorohalide phosphors; laser-beam formation; coherent light; optical mirrors; raster scanning; translation; digitization; cassette throughput and plate erasure. The document also reviews the relationship among kVp, mAs, phosphor response, quantum mottle, spatial resolution, matrix size, grid frequency, grid ratio, scatter and exposure indicators, as well as common imaging-plate and reader artifacts. LRA 221 Finals Review 2026
The final portion concentrates on digital detector technology and flat-panel imaging. It covers scintillators, thin-film transistors, amorphous selenium (a-Se), indirect conversion, detector performance, image lag and readout processes. Students also review charge-coupled devices (CCD) and complementary metal-oxide-semiconductor (CMOS) detectors, including optical coupling, image-size reduction, silicon integrated circuits, quantum efficiency and relative power consumption. These sections make the document especially useful for reviewing the physical principles and terminology behind contemporary digital radiographic image acquisition and processing. LRA 221 Finals Review 2026
Relevant students: This document is particularly relevant to LRA 221 students, radiologic technology and radiography students, medical imaging students, diagnostic radiography learners, radiation sciences students, and students preparing for examinations covering computed and digital radiography, image acquisition, image processing, PACS/DICOM and digital detector technology. The uploaded document clearly identifies LRA 221 as the course code, but it does not identify a university or institution, so adding an institution name to the title would require unsupported information. LRA 221 Finals Review 2026
Keywords: LRA 221 final exam 2026, LRA 221 final exam 2027, LRA 221 finals review, LRA 221 questions and answers, digital radiography exam, computed radiography exam, CR and DR questions, radiologic technology final exam, radiography exam questions, digital imaging study guide, PSP imaging plate, photostimulable phosphor, barium fluorohalide, PACS questions, DICOM questions, digital image processing, image quality radiography, spatial resolution, contrast resolution, detective quantum efficiency, DQE radiography, exposure index, deviation index, histogram analysis, automatic rescaling, look up table radiography, window width and level, digital image artifacts, flat panel detector, direct conversion DR, indirect conversion DR, scintillator radiography, amorphous selenium a-Se, thin film transistor, CCD detector, CMOS detector, radiographic grids, quantum mottle, radiography final review, medical imaging exam preparation
Content preview
LRA 221 Finals Review
2026/2027 Exam Questions and
Answers | Already Graded A+
Film and intensifying screens are primarily used in - ANSWER
✔✔conventional radiography
CR acquires an image through: - ANSWER ✔✔The use of a storage
phosphor plate
Technologist efficiency ratings are generally the same when comparing
conventional radiography with ______ radiography. - ANSWER
✔✔computed
The active element in a storage phosphor is: - ANSWER ✔✔barium
fluorohalide
, In reference to PSP image capture, to release the latent image, which of
the following devices is scanned over the phosphor plate? -
ANSWER ✔✔Focused laser light
X-ray energy related in indirect capture DR will stimulate a ______,
which eventually is changed into an electrical signal. - ANSWER
✔✔scintillator
The ______ converts x-ray energy directly to a digital electrical signal. -
ANSWER ✔✔photoconductor
Exposure latitude is to conventional radiography as _______ is to DR. -
ANSWER ✔✔dynamic range
A look-up table maps - ANSWER ✔✔Image gray scale values
All of the following are components of a PACS except - ANSWER
✔✔independent kilovoltage peak and milliampere-second stations.
Similar to CR, DR can use the existing diagnostic equipment found in
today's imaging departments. - ANSWER ✔✔False- Can't use the
same equipment
Indirect capture DR converts absorbed x-ray energy into visible light. -
ANSWER ✔✔True- indirect DR convert X-ray energy to visible light