1. Analysis of Effective Radiating Area, Power, Intensity, and Field Characteristics of Ultrasound Transducers 
Lennart D. Johns, PhD, ATC, Stephen J. Straub, PhD, ATC, Samuel M. Howard, PhD 
Archives of Physical Medicine and Rehabilitation 
Volume 88, Issue 1, Pages (January 2007)
DOI: /j.apmr
Copyright © 2007 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

2. Fig 1
Schlieren image beam-width analysis. Lateral beam profiles were generated for each transducer at 1, 2, 3, 4, 5, 6, and 7cm from transducer surface. Beam widths at 40% and 80% LII were measured and used for comparative analysis of the Schlieren images.
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )
Copyright © 2007 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

3. Fig 2
Sample Schlieren images (left) and planar hydrophone scans (right) of ultrasound fields generated from transducers at 1.0MHz. Images are of transducer (A) and (B) The y axis of the Schlieren image permits measurements of the lateral width of the LII, while the z axis represents the distance of the beam relative to the transmitting surface of the ultrasound transducer. The LII of the ultrasound field is represented in color with low intensities in blue and increasing intensity in yellow and red, respectively.
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )
Copyright © 2007 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

4. Fig 3
Schlieren images (left) and planar hydrophone scans (right) of ultrasound fields generated from transducers at 3.3MHz. Images are of transducer (A) and (B)
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )
Copyright © 2007 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

5. Fig 4
Beam-width analysis of Schlieren images at 80% LII of 1.0 and 3.3MHz beams. NOTE: Values are mean ± standard deviation.
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )
Copyright © 2007 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

6. Fig 5
Beam-width analysis of Schlieren images at 40% LII of 7 individual transducers at (A) 1.0MHz and (B) 3.3MHz.
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )
Copyright © 2007 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions