PMID- 37296765 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20230612 IS - 2075-4418 (Print) IS - 2075-4418 (Electronic) IS - 2075-4418 (Linking) VI - 13 IP - 11 DP - 2023 May 30 TI - Fat Hounsfield Unit Reference Interval Derived through an Indirect Method. LID - 10.3390/diagnostics13111913 [doi] LID - 1913 AB - BACKGROUND: In vivo Hounsfield Unit (HU) values have traditionally been determined using direct CT image measurements. These measurements are dependent on the window/level used to examine the CT image and the individual conducting the fat tissue tracing. METHODS: Using an indirect method, a new reference interval (RI) is proposed. A total of 4000 samples of fat tissues were collected from routine abdominal CT examinations. A linear regression equation was then calculated using the linear part of the cumulative frequency plot of their average values. RESULTS: The regression function for total abdominal fat was determined to be y = 35.376*x - 123.48, and a 95% confidence RI of -123 to -89 was computed. A significant difference of 3.82 was observed between the average fat HU values of visceral and subcutaneous areas. CONCLUSIONS: Using statistical methods and the in vivo measurements of patient data, a series of RIs were determined for fat HU that is consistent with theoretical values. FAU - Pop, Marian AU - Pop M AUID- ORCID: 0000-0001-5324-9780 AD - ME1 Department, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 540139 Tirgu Mures, Romania. AD - Radiology and Medical Imaging Department, Tirgu Mures Emergency Institute for Cardiovascular Diseases and Heart Transplant, 540136 Tirgu Mures, Romania. FAU - Marusteri, Marius AU - Marusteri M AD - M2 Department, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 540139 Tirgu Mures, Romania. LA - eng PT - Journal Article DEP - 20230530 PL - Switzerland TA - Diagnostics (Basel) JT - Diagnostics (Basel, Switzerland) JID - 101658402 PMC - PMC10252728 OTO - NOTNLM OT - computed tomography OT - fat Hounsfield unit OT - indirect method OT - reference interval COIS- The authors declare no conflict of interest. EDAT- 2023/06/10 15:13 MHDA- 2023/06/10 15:14 PMCR- 2023/05/30 CRDT- 2023/06/10 01:02 PHST- 2023/04/23 00:00 [received] PHST- 2023/05/23 00:00 [revised] PHST- 2023/05/29 00:00 [accepted] PHST- 2023/06/10 15:14 [medline] PHST- 2023/06/10 15:13 [pubmed] PHST- 2023/06/10 01:02 [entrez] PHST- 2023/05/30 00:00 [pmc-release] AID - diagnostics13111913 [pii] AID - diagnostics-13-01913 [pii] AID - 10.3390/diagnostics13111913 [doi] PST - epublish SO - Diagnostics (Basel). 2023 May 30;13(11):1913. doi: 10.3390/diagnostics13111913.