P24.14: Influence of persistence on assessment of placental time‐averaged maximum perfusion (TAMP) in healthy fetuses
Year: 2010
Type: conference-abstract
Abstract: Persistence can affect the power Doppler ultrasound (PDU) recordings and the calculation of fractional moving blood volume (FMBV). We aimed to evaluate the influence of 3 different persistence levels (smoothing) at the same region of interest. Anterior placentas were evaluated for placental perfusion assessment by time-averaged maximum perfusion (TAMP) on a 2D cine sequence in 16 normal pregnant women with singleton pregnancies. The power Doppler (PDU) color box was placed in a sagittal plane of the placenta with visualization of the site of insertion of the umbilical cord. The PDU color box was adjusted to the maximum placental length and height with the following settings: low-pass filter, pulse repetition frequency of 0.6 kHz, and normal quality image. A 4–5 seconds video sequence was saved in an AVI format without compression for off-line analysis. Three recordings from the same area were saved using 3 smoothing levels (1/1, 6/6, 12/12). Recordings were obtained without maternal and fetal movements. For analysis, in the first image of each video sequence the region of interest (ROI) was delineated and then all the images included in the video loop were automatically calculated, the final value was termed Time-Averaged Maximum Perfusion (TAMP). Difference between 3 smoothing levels was evaluated by the ANOVA test and the statistical significance accepted for p values was < 0.05. The mean and range of values for the 3 levels of smoothing (1/1, 6/6, 12/12) were 10.6% (5.0–21.8%), 15.6% (7.9–24.6%) and 18.6% (13.4–26.5%) respectively. There was a significant difference between the 3 levels of smoothing (P = 0.01). There is a strong influence of the smoothing level when evaluating perfusion by TAMP method. The highest level of persistence is associated with higher FMBV values. For real blood perfusion evaluation, the lowest persistence might be used.
DOI: 10.1002/uog.8642
Language: English
Subfield: Obstetrics and Gynecology
Field: Medicine
Domain: Health Sciences
Open Access status: bronze
OpenAlex ID: W1992485052