define mesh axial extent to be foc depth + 25 mm
define mesh axial extent to be foc depth + 25 mm

50% beyond the focal depth was not enough for the
shallow (30 mm) case and was too deep for the 70 mm
case

Guokr1991/QIBA-DigitalPhantoms,RSNA-QIBA-US-SWS/QIBA-DigitalPhantoms,Guokr1991/QIBA-DigitalPhantoms,RSNA-QIBA-US-SWS/QIBA-DigitalPhantoms,Guokr1991/QIBA-DigitalPhantoms,RSNA-QIBA-US-SWS/QIBA-DigitalPhantoms