IUDs are seen as brightly echogenic structures in uterine cavity. The appearance depends upon the type of IUD. The normal location for an IUD is centered in the uterine cavity near the fundus. Copper-wrapped IUDs are intensely echogenic and cause comet tail artifacts (Fig. 5.17). Most are in...
Ultrasensitive nanosensors based on upconversion nanoparticles for selective hypoxia imaging in vivo upon near-infrared excitation. J Am Chem Soc. 2014;136(27):9701–9. PubMed Google Scholar Zhou X, Liang H, Jiang P, et al. Multifunctional phosphorescent conjugated polymer dots for hypoxia ...
This necessitates the calculation of all phase and apodization maps before the imaging session. The emitted field can be dynamically regulated to generate shifted patterns, allowing for image acquisition and subsequent reconstruction of a super-resolution image. The development of methods for super-...
Harmonic imaging enhances near-field resolution and reduces low- frequency and large amplitude noise, so as to improve small parts imaging. Select the frequency according to the detection depth and current tissue features. Gain Description Operations Effects To adjust the gain of the whole receiving ...
g. Field II, can only deal with the fast computation of pulse-echo PSF of regular arrays. The calculation of pulse-echo PSF of an arbitrary array can only be conducted in the time domain because of the existence of nonuniform nodes in computation of array spatial responses, which obstructs...
The calculation is based on linearized equations of motion for the spins and on an improved mean field approximation which includes the Onsager reaction field. Near to the freezing temperature T f and at high temperatures δ v (ω, T ) and ωγ(ω, T ) turn out to be approximately ...
28. The design of tapered fiber optoacoustic emitters with a diameter of 20 µm, enables selective activation of subcellular structures as a point source of ultrasound28. However, since they exploit near-field ultrasound for localized neuromodulation, fiber optoacoustic emitters need to be ...
The calculation of the percentage of time spent on the novel object relative to the total time spent on both objects was expressed as TNovel/(TNovel + TOld) × 100, where TNovel represents the time allocated to the novel object, and TOld represents the time devoted to the ...
Possibly the dye particles could not penetrate the interior of the fiber because of their larger molecular size compared to the conventional water-soluble dyes and remained on the surface or near the surface. Sonication was also studied for the vatting of vat dyes using conventional reducing ...
NIR, near infrared. Error bar denotes standard deviation. Full size image Figure 2b shows the simulated light transmittance of 30 MHz quarter-wave plates as a function of the acoustic impedance of the ceramic-epoxy composite materials in Fig. 2a. The results in Fig. 2a and b indicate that...