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Probe Maneuvers
ОглавлениеThere is one basic concept and six basic probe movements used in acquiring the ultrasound image. Beginning sonographers often miss their mark because they lack structured movement of the probe when scanning. Being able to make one type of movement at a time is essential to obtain a good image. To the casual observer, it may appear that the experienced sonographer makes free‐flowing and complex moves with the probe; however, the reality is that they are simply integrating the six foundational movements one movement at a time.
Pearl: When optimizing image acquisition, a good rule of thumb is to only perform one probe maneuver at a time.
Figure 4.4. Electronic ultrasound probes and their characteristic B‐mode images. The probe used for the ultrasound image is easily recognized by the ultrasound image's shape. From left to right in (A) are examples of the following probes (transducers): phased‐array (also known as sector), linear, and curvilinear (also referred to as microconvex). A molded reference marker can be seen on all three of these probes. Other probes may use an LED light as the reference marker. The rubber probe heads (gray) represent the "footprint" or contact surface of each probe which differ between probe (transducer) types. (B) The phased‐array probe ultrasound image is pie‐shaped with a near‐field "point." Phased‐array is ideal for echocardiography because it best avoids ribs (note no rib shadow). (C) Linear probe ultrasound image with its rectangular shape. Linear is superior in detail because it sends and receives ultrasound waves 90° to the structure(s) of interest. (D) Curvilinear probe ultrasound image is pie‐shaped but wide and concave in the near‐field. Curvilinear (microconvex) is most commonly used by nonradiologist veterinarians because of its versatility.
Let us take a look at the one concept and the six basic or foundational probe maneuvers (Bahner et al. 2016).