To send content items to your account,
please confirm that you agree to abide by our usage policies.
If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account.
Find out more about sending content to .
To send content items to your Kindle, first ensure firstname.lastname@example.org
is added to your Approved Personal Document E-mail List under your Personal Document Settings
on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part
of your Kindle email address below.
Find out more about sending to your Kindle.
Note you can select to send to either the @free.kindle.com or @kindle.com variations.
‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi.
‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
The fundamental principal of diagnostic ultrasound relies on the transmission of sound into the patient's body and reception of reflected sound, which is then displayed as data for interpretation. As with the time gain control (TGC) control, the gain control allows a manual adjustment of the intensity of the returning echoes. The unit of measure is the decibel and may be displayed on the screen as "db" or as a numerical value. The depth control allows the operator to manually adjust the field of view, determining how much of the information deep to the probe is displayed. This chapter presents an introduction to the modes of Doppler available on common ED systems. The sonographer must select a transducer for each exam with consideration of the patient's body habitus and the anatomy to be visualized. Image artifacts may result from transducer design, anatomical interfaces, and ultrasound beam properties.
The use of ultrasound in the evaluation of soft tissue structures has many potential applications. When evaluating a soft tissue infection with ultrasound, consideration of several key principles will increase the potential for successful image acquisition. Soft tissue foreign bodies represent a troubling entity for emergency physicians. They often pose remarkable clinical challenges, in identification and removal, and represent a significant component of malpractice claims against emergency physicians. Most soft tissue ultrasound is best performed with a high-frequency (7 to 13 MHz) linear probe. The detection of foreign bodies may prove to be of difficulty for the novice sonologist. The differentiation between peritonsillar cellulitis and abscess can be difficult based solely on clinical findings. As with many soft tissue ultrasounds, appropriate patient preparation will improve both procedural tolerance and image acquisition. The primary limitation in the sonographic evaluation of suspected peritonsillar abscess is patient tolerance.
Email your librarian or administrator to recommend adding this to your organisation's collection.