RADR 1411 Chapter 6 Exam Review (120 Questions) – Central Ray, Positioning, Technique Factors & Projections | 2026 – Radiologic Technology

This document provides a comprehensive set of approximately 120 exam-style questions and correct answers for RADR 1411 Chapter 6, focusing on central ray (CR) placement, radiographic positioning, and technique factors for lower extremity imaging. It covers essential projections for the foot, ankle, lower leg, and knee, including AP, oblique, lateral, and weight-bearing views. The structured Q&A format allows students to efficiently review positioning accuracy, image evaluation criteria, and exposure techniques. The material offers in-depth coverage of technical factors such as SID, grid usage, image receptor (IR) size, and kVp ranges for each projection. It also explains precise CR locations and angulations, including positioning at the base of the 3rd metatarsal, medial malleolus, and patella landmarks. For example, the tables on pages 2–6 clearly outline CR angles (such as 10° posterior for AP foot and 40° cephalad for calcaneus), which are critical for producing diagnostic-quality images. Additionally, the document integrates positioning techniques such as foot rotation, dorsiflexion, and limb alignment, along with evaluation criteria for proper anatomical demonstration and superimposition. It also expands into lower extremity imaging beyond the foot and ankle, including knee and lower leg projections with detailed CR adjustments based on patient anatomy and measurement. This resource is ideal for students enrolled in Radiologic Technology, Diagnostic Medical Imaging, or Radiography programs. It is particularly useful for courses such as RADR 1411 – Radiographic Procedures I, Positioning and Anatomy, or Extremity Imaging offered at universities, community colleges, and allied health institutions. It is especially beneficial for first-year radiography students preparing for positioning labs, competency check-offs, or practical exams. The content aligns closely with standard textbooks such as Merrill’s Atlas of Radiographic Positioning and Procedures by Jeannean Hall Rollins and Radiographic Imaging and Exposure by Terri L. Fauber, making it an excellent supplementary study guide for mastering both theoretical concepts and clinical positioning skills. Keywords: central ray, CR positioning, technique factors, radiographic positioning, RADR 1411, foot projections, ankle projections, knee positioning, lower leg radiography, SID, kVp techniques, grid usage, image receptor size, calcaneus projection, ankle mortise, radiography exam questions