Open AccessCOMPUTER‐AIDED VOLUME MEASUREMENT OF CHOROIDAL MELANOMAS
Author(s) -
Gosbell ANDREW D.,
R. Barry WILLIAM,
Favilla IAN
Publication year - 1987
Publication title -
australian and new zealand journal of ophthalmology
Language(s) - English
Resource type - Journals
eISSN - 1440-1606
pISSN - 0814-9763
DOI - 10.1111/j.1442-9071.1987.tb00095.x
Subject(s) - volume (thermodynamics) , computer science , calibration , reproducibility , software , transducer , ultrasound , computer vision , instrumentation (computer programming) , artificial intelligence , radiology , mathematics , medicine , acoustics , physics , statistics , quantum mechanics , programming language , operating system
Using a combination of conventional 8‐scan ultrasonography, standard video techniques, computer image digitisation and area analysis, it is possible to measure the volume of choroidal melanomas by area calculation of successive ultrasound image slices, allowing the monitoring of such tumours The design of a combined water‐bath and linear tracking 8‐scan transducer is presented, together with a description of the instrumentation and computer software required The results of volume measurements performed upon eye models demonstrated that melanomas of volume greater than 100 mm 3 could be measured with an average error of 6%. The problems associated with linear calibration of the system from scan‐head to analysed image, resolution of the digitised image, reproducibility of the measurements, sources of error and assumptions made in formulating the measurement procedure are discussed.