RTE 1401 Exam 3 2026/2027 | 100+ Questions & Answers | Film Processing, CR/DR, Grids, Scatter, Digital Imaging & Image Quality

. The four CR acquisition stages are expose, stimulate, read and erase: x-ray energy is stored in the PSP, laser stimulation releases energy as light, the PMT collects and converts the signal, the ADC produces digital data and intense white light erases residual information from the plate. The document then examines scatter production, collimation and beam restriction. kVp and the amount of irradiated tissue are presented as major influences on scatter production, while collimation and compression are reviewed as methods of reducing scatter. Beam-restricting devices include aperture diaphragms, cones, cylinders, adjustable collimators and Positive Beam Limitation (PBL) systems. The material explains how PBL automatically adjusts the primary beam to the cassette or image-receptor dimensions. A substantial portion covers radiographic grids and grid errors. Students review grid frequency, lead content, oscillating and reciprocating movement, grid ratios and scatter absorption. Five common errors are discussed: off-level, off-focus, off-center, upside-down and moiré effect. The resource describes how these errors affect receptor exposure and image appearance, including peripheral underexposure and the striped or zebra-like pattern associated with moiré artifacts in computed radiography. Grid-use criteria, calipers and the air-gap technique are also included. The final pages compare direct and indirect digital radiography. Direct DR is described as using amorphous selenium (a-Se) to convert x-rays into an electrical signal, whereas indirect DR uses scintillators such as cesium iodide and gadolinium oxysulfide with amorphous silicon (a-Si) to convert x-rays first to light and then to an electrical signal. Additional concepts include CCDs, TFT arrays, detector elements, histograms, values of interest, ADC conversion, matrix size, pixel pitch, field of view and pixel size. The resource concludes by relating smaller pixels, larger matrices and smaller pixel pitch to higher spatial resolution, while distinguishing window level for brightness from window width for contrast. Relevant Students: This resource is particularly relevant to students enrolled in RTE 1401 or comparable radiographic physics and imaging courses, especially radiography and radiologic technology students preparing for Exam 3 during 2026/2027. It is useful for students studying film processing, intensifying screens, CR and DR systems, scatter control, grids, digital detectors, image artifacts and digital image-quality principles. The uploaded document does not identify a specific university or college, so an institution has not been attributed without supporting evidence. Keywords: RTE 1401 Exam 3, RTE , RTE 1401 questions and answers, RTE 1401 radiographic physics, radiographic physics Exam 3, radiography exam questions, film screen radiography, direct exposure film, intensifying screens, screen speed radiography, film processing radiography, developer and fixer, phenidone hydroquinone, radiographic artifacts, computed radiography, CR imaging, photostimulable phosphor, PSP plate, photomultiplier tube, digital radiography, direct DR, indirect DR, amorphous selenium, amorphous silicon, cesium iodide scintillator, TFT array, CCD radiography, scatter radiation, scatter control, x ray collimation, positive beam limitation, PBL radiography, radiographic grids, grid ratio, grid errors, off level grid, off focus grid, off center grid, moire effect, air gap technique, digital image matrix, pixel pitch, spatial resolution, histogram radiography, window level, window width, radiologic technology study guide