20.500.12556/DiRROS-29605 Možnosti identifikacije periferne arterijske bolezni na osnovi infrardeče termografije preliminarni rezultati Possibilities for identifying peripheral arterial disease using infrared thermography Raziskujemo možnosti uporabe termografskih slik za identifikacijo prisotnosti periferne arterijske bolezni (PAB). Namen je opredeliti vlogo termografije kot dodatne preiskave pri ugotavljanju stopnje prizadetosti arterij. V raziskavi se osredotočamo na termograme podplatov. Pri večji prizadetostižilja udov je pretok krvi do podplata nižji, posledično pa je spremenjena površinska temperatura podplata. Postavljamo izhodiščno hipotezo, da je ta sprememba merljiva s termogramom. Termogram obdelamo s klasičnimi tehnikami računalniškega vida in izločimo interesno območje levega oziroma desnega podplata. Za podplat nato izračunamo povprečje in standardno deviacijo površinske temperature ter primerjamo njun diskriminativni potencial pri ločevanju vzorcev PAB od vzorcev zdrave populacije. Pri validaciji se opiramo na referenčno klinično sliko in morfološke preiskave prizadetih arterij. Upoštevamo v kliničnem okolju pridobljenih 27 termogramov podplatov prizadetega uda z ugotovljeno zaporo vsaj ene izmed arterij, ki dovajajo kri v področje podplata, in 34 termogramov podplatov zdravih prostovoljcev. Čeprav je statistična različnost med obema populacijama potrjena za obe spremenljivki, preliminarni rezultati kažejo, da ima standardna deviacija večji diskriminativni potencial kot povprečje površinske temperature podplata. Za 83 % obravnavanih vzorcev PAB bolnikov z arterijskimi zaporami je vrednost standardne deviacije nižja od minimalne vrednosti za zdravo populacijo. Pearsonov korelacijski koeficient med gleženjskim indeksom in povprečno površinsko temperatu We present the preliminary results from a study investigating the use of thermographic images to identify the peripheral arterial disease (PAD). Our aim is to define the role of thermography as an additional examination in determining the degree of the arterial impairment. We focus on thermograms of the sole. A greater impairment of the leg arteries leads to a reduced blood flow to the sole and, consequently altered surface temperature. We set the initial hypothesis that this change is measurable with a thermogram. We analyse the thermograms by determining the regions of interest on the subject's left and right sole using classical computer vision techniques, including edge detection, contouring, connecting disconnected contours, masking, and manual correction. For each region of interest, we calculate the mean and standard deviation of the surface temperature and compare the discriminative potential of these variables in distinguishing PAD samples from those of the healthy population. For validation, we rely on reference clinical data and morphological examinations of the affected arteries. We analyse 27 thermograms of the soles of patients with PAD. For each of sample, complete occlusion of at least one artery supplying blood to the sole is confirmed by a morphological examination. We also analyse 34 thermograms of the soles of healthy individuals. All thermograms are obtained in a clinical setting. Although statistical differences between the two populations are confirmed for both variables, our preliminary results suggest that the standard deviation has a greater discriminative potential than the mean sole surface temperature. For 83% of the PAD patient samples with arterial occlusions, the standard deviation value is lower than the minimum value observed in the healthy population. The Pearson correlation coefficient between the ankle-brachial pressure index and the mean and standard deviation of the sole surface temperature are 0.20 and 0.63, respectively. Finally, considering the temperature normalisation in this preliminary study does not support a stronger correlation between either the mean or the standard deviation of the surface temperature and the ankle-brachial pressure index. In the future, a much larger study should be conducted to confirm these results. Based on the results of a larger study, a standardised model for the PAD identification could be developed. In addition to defining the expected ranges of standard deviation values of surface temperature for the PAD patients and healthy individuals, temperature distribution patterns in relation to the degree of the arterial impairment could also be investigated. Moreover, it would be extremely valuable to repeat this investigation using thermograms of PAD patients before and after various revascularisation procedures. Finally, with a sufficiently large database of thermograms, future studies should also focus on an automatic recognition of regions of interest using machine and deep learning techniques. infrardeca termografija periferna arterijska bolezen angiografija gleženjski indeks računalniški vid infrared thermography peripheral artery disease angiography ankle-brachial pressure index computer vision true false true Slovenski jezik Angleški jezik Neznano 2026-06-01 09:59:24 2026-06-01 09:59:25 2026-06-02 03:48:23 0000-00-00 00:00:00 2026 0 0 str. 56-62 št. 1/2 Letn. 93 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 004.93:616.13-004.6 0013-5852 279875587 Stancin.pdf Stancin.pdf 1 40BF4BC579945D8967F77882870EFF04 76444bbfdf0cf759b99d3fe79c44aa0e0e7bd9ecaf5de37ff9d47d0dc32c87d0 cf2e0835-5d8f-11f1-8e51-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=44436 https://ev.fe.uni-lj.si/1-2-2026/Stancin.pdf 0 1986ed92-5d90-11f1-8e51-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=44437 Univerzitetni klinični center Ljubljana 0 0 0