In our experience, the detection rates of TUS-OCCA for gastric polyps, which usually present with a mid to high echo, are low; the detection rates of TUS-OCCA for gastric cancer, which usually presents as hypoechoic thickening of the gastric wall, are high.
The locations of areas with buildings correspond to areas of high echo intensity in the image, while grassy areas exhibit a low reflectivity.
Recently, 3D TSE sequences (e.g. SPACE) have been used to assess the knee joint with high spin-echo contrast resolution and isotropic spatial resolution, improving conspicuity of cartilage lesions [5, 21].
At least for one plane, we recommend imaging with a higher echo-time, which delineates fistulas very clearly.
It is known that an echocardiogram performed by physicians with adequate training can differentiate coronary anomalies with high sensitivity, and therefore echo is again a key tool to unmask these asymptomatic patients.
PCI is applied to detection in presence of reverberation by taking reverberation as a sum of echoes with higher power than target echoes.
The RTV plot on the HF radar beam 1 is shown in Fig. 3(b), where the strong HF echoes with high positive velocities exist only at 0745 0820 JST before the VHF-MSE appearance at around 0820 JST.
Clearly, the echo regions with high positive Doppler velocities with a maximum of about 60 m/s move southward with time and away from the radar FOV after 0800 JST.
This is the basis of 3D FSE imaging [ 14], but one may question whether long echo trains (with high to low switching for refocusing angles within a short TE period) can ever be a good solution for T1 spin echoes.
A conventional 3D gradient-echo sequence (LAVA-Flex) commonly used for MRI-based AC of PET (acquisition time of 14 s), a T1w fast spin-echo sequence with high bandwidth (acquisition time of 3.2 min), as well as MAVRIC SL sequence without and with increased phase acceleration (MAVRIC, acquisition time of 6 min; MAVRIC-fast, acquisition time of 3.5 min) were applied.
