Kai Yang, PhD

Cone-beam CT (CBCT) has rapidly expanded across diverse clinical applications, yet fleet-wide benchmarking of imaging performance remains challenging due to wide variation in acquisition hardware, reconstruction pipelines, and vendor-driven quality control (Q...

Photon-counting detector (PCD)–based cone-beam CT (CBCT) is gaining increasing interest for its potential to enable high-resolution and spectrally rich imaging. This study develops a tabletop PCD-CBCT system as a research platform and reports our progress in...

Photon-counting detectors (PCD) exhibit high sensitivity for scattered photons, enabling kilovoltage (kV) scattered X-ray imaging with potential for real-time tumor tracking for lung cancer radiotherapy. The performance in this application is strongly influen...

AAPM Task Group 430 aims to comprehensively evaluate organ and effective dose (ED) estimations from whole body CT data to support recommendations for DLP-to-ED conversions factors and their associated uncertainties. Accurate whole-body organ segmentation is c...

Though digital breast tomosynthesis has been standard of care for over 15 years, the image acquisition parameters, especially the acquisition angles, encompass a wide range of variations. A question that warrants further investigation is the image quality tra...

This session will review the current status and expansion of MIDRC as a unique, large-scale source of curated and harmonized imaging data spanning multiple modalities and body regions. MIDRC’s resources are specifically designed to meet the AI community’s cri...

Quantitative imaging of 177Lu radioactivity in radiopharmaceutical therapy is desired to capture its time-dependent biodistribution for dosimetry. We propose a novel imaging system using photon-counting detector (PCD) for high-sensitivity quantitative activit...

Accurate calibration in photon-counting detectors (PCDs) for inhomogeneous pixel responses caused by charge sharing, pulse pile-up, and energy-dependent efficiency is the most critical and challenging task for PCD-based imaging applications. Conventional gain...

Breast cancer prevention strategies rely upon effective tools to identify "at risk" women who are more likely to develop breast cancer. Risk-stratified screening has been proposed to optimize screening for patients and better use resources, which is equally i...

Breast cancer prevention strategies rely upon effective tools to identify "at risk" women who are more likely to develop breast cancer. Risk-stratified screening has been proposed to optimize screening for patients and better use resources, which is equally i...

This is an one-hour session with the speaker nominated and elected by the Ultrasound Subcommittee of the AAPM. This C-Z lectureship program during the coming AAPM Annual Meeting in July 2026 has been approved by AAPM.

A recent controversial study in NEJM reported associations between hematologic malignancy and low estimated bone marrow dose (≤1 mGy) from pediatric CT. Accurate interpretation of such findings requires a clear understanding of uncertainty in organ dose estim...

To evaluate the spatial resolution of an X-ray scatter imaging system utilizing a Photon Counting Detector (PCD) for real-time lung tumor tracking. Unlike transmission imaging, scatter imaging offers direct 3D tumor localization. This study quantifies the sys...