This study investigates the microscopic jet formation dynamics of a piezoelectric vibrating-mesh atomizer operating at 100.7 kHz. Because direct single-cycle imaging of such high-frequency micro-jetting is limited by the trade-off between camera frame rate, optical magnification and image quality, an inter-cycle imaging method (ICIM) is used to reconstruct the phase-resolved evolution of the jetting process. The reconstructed images show that effective jetting occurs mainly during a limited part of the negative half-cycle, with an active ejection duration of approximately 0.34 T. The jet-front velocity obtained from image-based tracking ranges from approximately 40 to 160 m/s under the present operating condition. The maximum jet length and local jet velocity show a non-monotonic radial distribution, which is consistent with the spatially non-uniform vibration amplitude of the atomizing plate and the presence of nodal regions. A semi-empirical velocity estimate is used to relate the local vibration amplitude to the jet velocity and the single-aperture atomization volume. The calculated atomization volume is higher in the central active region than in the peripheral region, indicating that a uniform aperture layout may not be optimal. The uncertainties are mainly associated with phase reconstruction, jet-front identification, spatial calibration and the lumped coefficient used in the semi-empirical model; therefore, the model should be regarded as valid for the present geometry and nearby operating conditions rather than as a universal predictive law.