calculated artery wall thickness measurement artery tunica media measurement artery tunica media width to artery inner diameter ratio 2018-05-15T17:08:42Z A calculated measurement in which the average width of the tunica media is divided by the inner diameter (that is, the diameter of the lumen) of the artery and the result is presented as a ratio, fraction, quotient or percentage. CMO:0002790 clinical_measurement_ontology jrsmith