3/11/2023 0 Comments Vaginal sonogram![]() This can be described in terms of velocity (in centimeters per second) and by using descriptive ratios depicting the difference in the systolic velocity and diastolic velocity. By displaying the Doppler frequency shifts that result from calculating the difference between the emitted frequency and the frequency of echoes returning from a moving target, a flow velocity waveform is created. The direction, velocity, and variability of blood flow can be evaluated ultrasonographically by using the principle of the Doppler effect. For a more in-depth analysis of these imaging principles, the reader is referred to standard texts on ultrasonography. In addition to understanding the need for close approximation of the imaging target by the transducer, realize that the quality of the image is influenced by the frequency of the transducer, pulse repetition frequency, and image processing. Because much of the imaging is performed with the use of “organ-specific” planes, the practitioner must be aware of the scanning orientation to achieve an accurate interpretation of the findings noted on the image. 12, 13 Accurate orientation is a necessity for the appropriate interpretation of pelvic imaging. Whereas scanning planes for transabdominal scanning are classically described as sagittal, axial, and oblique, the transvaginal approach offers the additional coronal scanning plane. 11 A thorough understanding of the longitudinal (sagittal), cross-sectional (axial), and coronal anatomy of the pelvis is necessary for optimal image interpretation. Every effort must be made to avoid interference with transmission of ultrasonographic energy. In general, the closer the transducer tip is to the imaging target, the greater the resolution, and, therefore, the clearer the image. The quality of an image ultimately depends on the degree of resolution. For optimum ultrasonographic visualization, certain mechanical, physical, and ultrasonographic principles must be understood. ![]()
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