Determination of fish gender using fractal analysis of ultrasoud images
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Determination of fish gender using fractal analysis of ultrasoud images. / McEvoy, Fintan; Tomkiewicz, Jonna; Støttrup, Josianne; Overton, Julie L.; McEvoy, Conni; Svalastoga, Eiliv Lars.
I: Veterinary Radiology & Ultrasound, Bind 50, Nr. 5, 2009, s. 519-524.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Determination of fish gender using fractal analysis of ultrasoud images
AU - McEvoy, Fintan
AU - Tomkiewicz, Jonna
AU - Støttrup, Josianne
AU - Overton, Julie L.
AU - McEvoy, Conni
AU - Svalastoga, Eiliv Lars
PY - 2009
Y1 - 2009
N2 - The gender of cod Gadus morhua can be determined by considering the complexity in their gonadal ultrasonographic appearance. The fractal dimension (DB) can be used to describe this feature in images. B-mode gonadal ultrasound images in 32 cod, where gender was known, were collected. Fractal analysis was performed on these images and DB was determined using the box counting method. A receiver-operating curve (ROC) was drawn for DB as a test for male fish. Using a range of DB values, the maximum accuracy for this test was calculated and compared with the accuracy for identifying male fish by subjective analysis alone. The mean (and standard deviation) of the fractal dimension DB for male fish was 1.554 (0.073) while for female fish it was 1.468 (0.061); the difference was statistically significant (P=0.001). The area under the ROC curve was 0.84 indicating the value of fractal analysis in gender determination in cod. Maximum accuracy (0.84) for DB as a test for male fish was obtained using the threshold value DB=1.5058 compared with an accuracy of 0.78 for subjective image evaluation. The use of two thresholds, DB<1.4475 (females) and DB>1.5054 (males) gives an 80% certainty in the classification result. Fractal analysis is useful for gender determination in cod. This or a similar form of analysis may have wide application in veterinary imaging as a tool for quantification of complexity in images
AB - The gender of cod Gadus morhua can be determined by considering the complexity in their gonadal ultrasonographic appearance. The fractal dimension (DB) can be used to describe this feature in images. B-mode gonadal ultrasound images in 32 cod, where gender was known, were collected. Fractal analysis was performed on these images and DB was determined using the box counting method. A receiver-operating curve (ROC) was drawn for DB as a test for male fish. Using a range of DB values, the maximum accuracy for this test was calculated and compared with the accuracy for identifying male fish by subjective analysis alone. The mean (and standard deviation) of the fractal dimension DB for male fish was 1.554 (0.073) while for female fish it was 1.468 (0.061); the difference was statistically significant (P=0.001). The area under the ROC curve was 0.84 indicating the value of fractal analysis in gender determination in cod. Maximum accuracy (0.84) for DB as a test for male fish was obtained using the threshold value DB=1.5058 compared with an accuracy of 0.78 for subjective image evaluation. The use of two thresholds, DB<1.4475 (females) and DB>1.5054 (males) gives an 80% certainty in the classification result. Fractal analysis is useful for gender determination in cod. This or a similar form of analysis may have wide application in veterinary imaging as a tool for quantification of complexity in images
U2 - 10.1111/j.1740-8261.2009.01568.x
DO - 10.1111/j.1740-8261.2009.01568.x
M3 - Journal article
VL - 50
SP - 519
EP - 524
JO - Veterinary Radiology
JF - Veterinary Radiology
SN - 1058-8183
IS - 5
ER -
ID: 15406425