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Combat-related trauma, including blast injuries, gunshots, and blunt force impacts, often result in bleedings, where internal bleedings are especially treacherous. Traumatic bleedings in the skull, chest and abdomen can all lead to severe complications and death if not promptly identified and treated. Early identification of these conditions allows for timely interventions, such as surgical procedures or other life-saving measures, which can significantly reduce mortality and improve recovery outcomes. Quick detection could also aid in effective triage, ensuring that those with life-threatening injuries receive immediate attention, optimizing the use of medical resources.Early identification of major internal bleedings in trauma patients is inherently difficult, even in a civilian context.1 X-ray imaging can be used to detect large bleedings whereas CT imaging might be needed for smaller bleedings.2 CT imaging is usually required to identify and diagnose intracranial bleedings.3 If a high-risk injury is suspected the patients should be transported to the highest-level trauma centre to receive optimal care.4 The chaotic and resource-limited environment of the battlefield often makes access to traditional diagnostic methods challenging, imposing risks for delays in start of treatment. This situation emphasizes the need for portable and efficient quantitative triaging and diagnostic tools. Portable ultrasound and the FAST assessment is one example that, can be used on the chest and abdomen.5 Microwave technology offers promising advancements in the triaging and detection of internal traumatic bleedings, particularly in prehospital and battlefield settings. This technology utilizes microwave signals to detect variations in tissue composition, which can indicate the presence of an internal bleeding.Microwave technology works by using microwave signals to penetrate tissues and detect anomalies. When these signals encounter areas with different dielectric properties, such as blood, they reflect differently compared to normal tissue. By analysing these reflections, the technology can identify and estimate the size of internal bleedings.At Chalmers University of Technology we develop technology for microwave measurements and signal processing and analysis with the aim to develop an easy to use, portable system for microwave based triaging and detection of traumatic bleedings. The system consists of several antennas, typically eight, placed strategically on the skin at the examined part of the body (figure 1). A vector network analyser is used to transmit and receive microwaves. It is coupled via a switch to the antennas, and the measurements are made by consecutively stepping through the desired antenna combinations. We investigate different types if methods for analysing the data, including machine learning and imaging. A main goal is to develop a prototype system suitable for pre-clinical and clinical evaluation. Abstract A12 Figure 1Two prototype antenna systems. The left side of the figure shows a belt that is suitable for chest and abdomen. The right side of the figure shows a prototype for the head. Images from6Disclosure The authors declare no competing interests. This work was supported in part by The Swedish Defence, which had no role in the study design, data collection, or analysis, and in part by Chalmers University of Technology.References Wohlgemut JM, Pisirir E, Stoner RS, et al. Identification of major hemorrhage in trauma patients in the prehospital setting: diagnostic accuracy and impact on outcome. Trauma Surg Acute Care Open. 2024 Dec;9:e001214. doi:10.1136/tsaco-2023–001214Zeiler J, Idell S, Norwood S, Cook A. Hemothorax: a review of the literature. Clin Pulm Med. 2020 Jan;20(1):1–12. doi:10.1097/CPM.0000000000000343.Savitsky E, Eastridge B, editors. Combat casualty care: lessons learned from OEF and OIF. Fort Detrick (USA): Office of the Surgeon General, Department of the Army. 2012 [cited 2025 Mar 30]. Available from: https://medcoeckapwstorprd01.blob.core.usgovcloudapi.net/pfw-images/borden/ccc/CCCFull.pdf American College of Surgeons. Best Practices Guidelines: The Management of Traumatic Brain Injury. Chicago (USA): American College of Surgeons; 2024 [cited 2025 Mar 30]. Available from: https://www.facs.org/media/vgfgjpfk/best-practices-guidelines-traumatic-brain-injury.pdf Brooks AJ, Price V, Simms M. FAST on operational military deployment. Emerg Med J. 2005;22:263–5. doi:10.1136/emj.2004.014308.Högberg N, Robertsson S, Strand A, Templin S, Wiklund Hellström T. Mikrovågsbaserad diagnostik av blödningar intrakraniellt och i buk/bröstkorg prehospitalt [Internet]. Gothenburg (Sweden): Chalmers University of Technology; 2025 [cited 2025 Jul 25]. Available from: https://odr.chalmers.se/items/41f1c4ff-c73a-45d1-8d6f-d488d49913ec/full