The Effectiveness of Spaced Learning, Interleaving, and Retrieval Practice in Radiology Education: A Systematic Review

Purpose: Radiology is a highly complex field that requires mastery over an ever-expanding body of knowledge. Spaced learning, interleaving, and retrieval practice are evidence-based learning strategies that enhance long-term retention of information. The aim of this systematic review is to assess the effectiveness of these interventions in the setting of radiology education. Methods: The authors searched MEDLINE, Embase, PsycInfo, ERIC, and forward and backward citations for studies published between database inception and February 19, 2023. Eligibility criteria for included studies were randomized and quasi-randomized controlled trials that investigated the impact of spaced, interleaved, or retrieval practice on knowledge retention of medical trainees after education related to medical imaging as assessed by postinterventional examination scores. Results: Of 1,316 records reviewed, 8 studies met eligibility criteria. Two studies investigated spaced learning, two studies interleaving, and six studies retrieval practice, including two trials that evaluated interventions incorporating both spaced learning and retrieval practice. Five of eight studies reported statistically significant differences between interventional and control groups on either immediate or delayed postinterventional examinations. Conclusions: Despite extensive evidence in support of spaced, interleaved, and retrieval practice within the broader literature, few studies have examined the effectiveness of these strategies in radiology education. Additional trials are required to evaluate the usefulness of incorporating these techniques into educational programs related to medical imaging.