Emergency Ultrasound Mary Ann Edens, M.D. Assistant Professor, Dept. of EM Direc

Emergency Ultrasound Mary Ann Edens, M.D. Assistant Professor, Dept. of EM Direc www.phwiki.com

Emergency Ultrasound Mary Ann Edens, M.D. Assistant Professor, Dept. of EM Direc

Foundas, Scott, Film Editor has reference to this Academic Journal, PHwiki organized this Journal Emergency Ultrasound Mary Ann Edens, M.D. Assistant Professor, Dept. of EM Director of Emergency Ultrasound Physics Sound waves with frequencies greater than 20 kHz are called ultrasound Medical ultrasound waves have frequencies between 1 – 20 MHz Sound waves are mechanical waves Created in the transducer by back in addition to as long as th displacement Physics in addition to Knobology

Connecticut Aero Tech School CT www.phwiki.com

This Particular University is Related to this Particular Journal

Physics Ultrasound transducers send out sound waves in addition to then “listen” as long as returning echoes Most transducers at this time send out waves only approximately 1% of the time Physics Acoustic impedance determines the amount of sound waves transmitted in addition to reflected by tissues Reflection occurs when the ultrasound beam hits two tissues (areas) having different acoustic impedance Large differences in impedances inhibit useful in as long as mation

Terms Hyperechoic Structure reflects most sound waves Structure appears white on screen

Terms Anechoic Structure allows most sound waves through Structure appears black on screen

Terms Echogenic Tissues in between Allow some sound waves through in addition to reflect others Structures appear in various shades of gray depending on amount of reflection

Terms Homogeneous Tissue has uni as long as m texture Terms Heterogeneous Various degrees of echogenicity present

Terms Isoechoic Two tissues with same amt of echogenicity Transducers The higher the frequency, the better the resolution The better the resolution, the better you can distinguish objects from each other Transducers Lower frequency

Transducers Higher frequency Transducers Linear Gives rectangular image Generally has higher frequency Good as long as looking at a smaller area in addition to as long as gauging depth Gives more of a one dimensional view Sometimes referred to as the vascular probe Transducers Linear

Foundas, Scott LA Weekly Film Editor www.phwiki.com

From Heller & Jehle. Ultrasound in Emergency Medicine. Philadelphia: W.B. Saunders, 1995, p. 202. Transducers Curvilinear Uses same linear orientation but arranged on a curved surface Generally lower frequency Gives a wider angle of view Transducers Curvilinear

Transducers The footprint refers to the portion of the transducer that contacts the patient Curvilinear transducers come with different footprints as long as different purposes

Sonographic Findings In cardiac arrest, four-chamber view may be difficult to see M-mode shows no movement in area of heart Central Line Placement US can be used as long as placement Easiest line to use as long as is IJ Place patient in Trendelenberg position if able Place linear probe on neck

Foundas, Scott Film Editor

Foundas, Scott is from United States and they belong to LA Weekly and they are from  Culver City, United States got related to this Particular Journal. and Foundas, Scott deal with the subjects like Motion Pictures

Journal Ratings by Connecticut Aero Tech School

This Particular Journal got reviewed and rated by Connecticut Aero Tech School and short form of this particular Institution is CT and gave this Journal an Excellent Rating.