Which mode of ultrasound help is Orbital biometry?: (A) A- mode, (B) B-mode, (C) M-mode, (D) D-mode
Answer is A. A Mode Ultrasound is Amplitude Mode used for measuring Axial length of Eyeball and Orbital Biometry. A scan in Opthalmology is the A Mode Ultrasound. B mode is used in routine ultrasonography. M mode is used in chest and obstetric USG. D mode is used for vessels.