{
  "id": 10531917,
  "title": "Hybrid Transport-of-Intensity and Polarization Differential Phase Contrast for Extended Spatial-Frequency Phase Imaging",
  "url": "https://urgent.news/2026/09/28/hybrid-transport-of-intensity-and-polarization-differential-phase",
  "topic": "science",
  "section": "Science",
  "published": "2026-09-28T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.09.28.754925v1?rss=1"
  },
  "original_language": "en",
  "account": "The Transport-of-Intensity Equation (TIE) and polarization differential phase contrast (pDPC) have limitations as standalone quantitative phase imaging techniques. TIE excels at recovering low spatial frequencies but struggles with fine detail, while pDPC excels at enhancing phase gradients but is inherently insensitive at zero frequency. The researchers have developed a hybrid reconstruction framework that integrates a single-shot pDPC measurement with an in-focus-defocused TIE image pair. These images are then fused in the Fourier domain using frequency-selective weighting. The illumination geometry is designed to maintain angular separation between the modalities, allowing for high-frequency phase-gradient acquisition in a single exposure while maintaining low-frequency sensitivity through symmetric illumination with a low numerical aperture. This innovative method requires only three intensity measurements, eliminating the need for interferometric stability or sequential asymmetric illumination. Experimental results show enhanced phase fidelity across all spatial frequencies, reduced halo artifacts, and improved recovery of both smooth and fine structural features. This compact and robust approach represents a significant step towards extended spatial-frequency phase imaging for dynamic and resource-constrained applications.",
  "summary": "The Transport-of-Intensity Equation (TIE) and polarization differential phase contrast (pDPC) exhibit transfer characteristics that limit their use as standalone quantitative phase imaging modalities. TIE provides stable recovery of low spatial frequencies but attenuates fine structure, while pDPC enhances phase gradients but is intrinsically insensitive near zero frequency. We present a hybrid…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}