Amplitude versus frequency transvaginal color Doppler sonography (TV-CDS). A: Frequency-based TV-CDS shows solid mass within the left ovary without significant.

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Amplitude versus frequency transvaginal color Doppler sonography (TV-CDS). A: Frequency-based TV-CDS shows solid mass within the left ovary without significant central flow. B: Same patient as in (A). Amplitude TV-CDS confirms lack of central vascularity and better delineates the peripheral rim of the vessels. C: Vascular-stained photomicro-graph shows large vessels within the wall of a hemorrhagic corpus luteum of patient shown in (A) and (B). D: Multiloculated, mostly cystic mass on frequency-based TV-CDS. One locule contained low-level echoes. E: Same patient as in (D). Amplitude TV-CDS showed vascularity within wall of this hemorrhagic corpus luteum cyst. The wall of the hemorrhagic locule shows more flow than the other walls. F: Frequency-based TV-CDS shows low-impedance, high-velocity flow within a solid ovarian mass. G: Same patient as in (F), showing similar impedance and velocities. This was a clear cell carcinoma. Source: COLOR DOPPLER SONOGRAPHY OF PELVIC MASSES, Sonography in Obstetrics and Gynecology: Principles & Practice, 7e Citation: Fleischer AC, Toy EC, Lee W, Manning FA, Romero RJ. Sonography in Obstetrics and Gynecology: Principles & Practice, 7e; 2014 Available at: https://obgyn.mhmedical.com/DownloadImage.aspx?image=/data/books/1414/fle_ch32_f015c.png&sec=76395956&BookID=1414&ChapterSecID=76395876&imagename= Accessed: October 30, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved