RTE 1401 Midterm Review 2026/2027 | 100+ Questions & Answers | mAs, kVp, Image Quality, Filtration, Grids & X-Ray Interactions

This RTE 1401 Review for Midterm 2026/2027 study resource contains 100+ questions, answers, definitions, formulas and key review points covering core radiographic physics and image-quality concepts. Across 17 pages, the document reviews radiation types, spatial resolution, SID and OID, distortion, intensifying screens, filtration and HVL, density and contrast, focal-spot size, collimation, grids, mAs and kVp, the 15% rule, x-ray emission spectra, interactions with matter, attenuation and differential absorption. The cover page identifies the material specifically as an RTE 1401 Midterm Review for the 2026/2027 academic period. The opening section distinguishes latent, manifest, primary, leakage, off-focus, remnant, scatter and secondary radiation. It also introduces line pairs per millimeter as a measure associated with image detail. The document then examines the technical factors influencing recorded detail, including focal spot, SID, OID and screen speed, while distinguishing penumbra, umbra, magnification, foreshortening and elongation. The intensifying-screen and filtration material covers phosphor layers, rare-earth materials, fast versus slow screen speeds and the screen-speed maintenance formula. Fast screens are associated in the document with more light, greater density, reduced detail and lower patient dose, while slow screens provide greater detail but require greater exposure. Filtration topics include inherent, added and total filtration, beam hardening and half-value layer (HVL), with total filtration presented as the combination of inherent and added filtration. A substantial portion concentrates on radiographic density, contrast and image quality. The resource discusses patient tissue type, part thickness, atomic number, scatter, optical density and densitometers. High contrast is associated with low kVp, short-scale contrast, fewer shades of gray and greater photoelectric absorption, whereas low contrast is associated with high kVp, long-scale contrast, more shades of gray and increased Compton scatter. It also distinguishes photographic properties—density and contrast—from geometric properties—detail and distortion. The document provides focused review of SID, OID and focal-spot relationships. Increased SID is associated with increased detail and decreased distortion, while increasing OID is associated with decreased density and detail and increased magnification. A smaller focal spot provides better detail. The resource also includes the density-maintenance formula for adjusting mAs when SID changes and discusses compensating for increased OID by increasing SID. The collimation and grid section explains beam restriction as reducing the size of the projected radiation field. Increasing collimation means decreasing field size, which the document associates with reduced scatter. Students review grid ratio, crosshatched and linear grids, parallel and focused linear designs, grid frequency and grid conversion factors for calculating mAs changes when moving between grid ratios. The midterm review also emphasizes mAs, kVp and x-ray emission spectra. mAs is presented as the primary controller of x-ray quantity or intensity, with doubling mAs doubling the number of x-rays. kVp primarily controls beam quality, energy and penetration. The document reviews the 15% rule, stating that a 15% increase in kVp is equivalent to doubling mAs, and distinguishes continuous from discrete x-ray emission spectra. The final section provides detailed revision of the five x-ray interactions with matter: photoelectric absorption, Compton scatter, coherent scatter, pair production and photodisintegration. The document identifies photoelectric absorption and Compton scatter as the two interactions relevant to diagnostic x-rays in its framework. It also covers annihilation events, attenuation, differential absorption and the occupational relevance of Compton scatter before concluding with a recap of the four image-quality properties: density, contrast, detail and distortion. Relevant Students: This document is particularly relevant to RTE 1401 students preparing for a midterm examination during 2026/2027, as well as radiography and radiologic technology students reviewing foundational radiographic physics and imaging principles. It is especially useful for revision of exposure factors, image quality, radiographic geometry, filtration, scatter control, grids and x-ray interactions. The uploaded document does not identify a specific college or university, so an institution has not been assigned without supporting evidence. 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