University of Michigan Medical School, Michigan Medicine
UDUS Urinary Dynamics and Ultrasound

Publications

Peer-Reviewed Articles

  1. K. Kalayeh, J. O. L. DeLancey, J. A. Ashton-Miller and J. B. Fowlkes. Mechanically-induced fiducial marker system for event-based synchronization of independent recording instruments. Meas. Sci. Technol., vol. 37, no. 32, pp. 325903 (2026). DOI PubMed
  2. K. Kalayeh, J. B. Fowlkes, S. Daignault-Newton, P. Schmidt, J. A. Ashton-Miller and J. O. DeLancey. Automated Ultrasound-Based Analysis of Urethral Kinematics in Stress Urinary Incontinence: A Pilot Study. Neurourol. Urodyn., vol. 45, no. 3, pp. 609-626 (2026). DOI PubMed
  3. H. Tai, F. Pipitone, K. Kalayeh, J. LaCross, J. A. Ashton-Miller, J. O. DeLancey and J. B. Fowlkes. Assessing Postpartum Levator Ani Muscle Recovery: A Feasibility Study on Automated Texture Analysis in Transvaginal Ultrasound. Ultrasound Med. Biol., vol. 51, no. 12, pp. 2217-2225 (2025). DOI PubMed
  4. C. X. Hong, M. Masteling, K. Kalayeh, J. LaCross, J. O. L. DeLancey and L. Chen. Automated Motion Tracking of Vaginal Pessaries and Pelvic Floor Structures on Dynamic MRI. Int Urogynecol J (2025). DOI PubMed
  5. K. Kalayeh, S. N. Ambani, M. Zhang, S. Daignault-Newton, B. L. Viglianti, R. Mediratta, W. W. Schultz, J. B. Fowlkes and B. S. Sack. Quantitative Dynamic Contrast-Enhanced Ultrasound Confirms Renal Obstruction: A Feasibility Study. J. Ultrasound Med., vol. 44, no. 8, pp. 1425-1435 (2025). DOI PubMed
  6. K. Kalayeh, J. B. Fowlkes, B. S. Sack, J. LaCross, S. Daignault-Newton, P. Schmidt, H. Tai, W. W. Schultz, J. A. Ashton-Miller and J. O. DeLancey. A New Automated Ultrasound Quantification of Urethral Mobility for Stress Urinary Incontinence: A Feasibility Study. J. Ultrasound Med., vol. 44, no. 7, pp. 1213-1227 (2025). DOI PubMed
  7. H. Tai, K. Kalayeh, J. A. Ashton-Miller, J. O. L. DeLancey and J. Brian Fowlkes. Urethral tissue characterization using multiparametric ultrasound imaging. Ultrasonics, vol. 145, pp. 107481 (2025). DOI PubMed
  8. K. Kalayeh, J. B. Fowlkes, H. Xie, W. W. Schultz and B. S. Sack. Peristalsis prevents ureteral dilation. Neurourol. Urodyn., vol. 43, no. 1, pp. 258-266 (2024). DOI PubMed
  9. K. Kalayeh, J. B. Fowlkes, J. Claflin, M. L. Fabiilli, W. W. Schultz and B. S. Sack. Ultrasound Contrast Stability for Urinary Bladder Pressure Measurement. Ultrasound Med. Biol., vol. 49, no. 1, pp. 136-151 (2023). DOI PubMed
  10. K. Kalayeh, J. B. Fowlkes, A. Chen, S. Yeras, M. L. Fabiilli, J. Claflin, S. Daignault-Newton, W. W. Schultz and B. S. Sack. Pressure Measurement in a Bladder Phantom Using Contrast-Enhanced Ultrasonography-A Path to a Catheter-Free Voiding Cystometrogram. Invest. Radiol., vol. 58, no. 3, pp. 181-189 (2023). DOI PubMed
  11. K. Kalayeh, H. Xie, J. B. Fowlkes, B. S. Sack and W. W. Schultz. Longitudinal wall motion during peristalsis and its effect on reflux. Journal of Fluid Mechanics, vol. 964, pp. A30.1 - A30.27 (2023). DOI
  12. K. Kalayeh, J. B. Fowlkes, W. W. Schultz and B. S. Sack. The 5:1 rule overestimates the needed tunnel length during ureteral reimplantation. Neurourol. Urodyn., vol. 40, no. 1, pp. 85-94 (2021). DOI PubMed
  13. K. Kalayeh, J. B. Fowlkes, W. W. Schultz and B. S. Sack. Ureterovesical junction deformation during urine storage in the bladder and the effect on vesicoureteral reflux. J. Biomech., vol. 113, pp. 110123-110121 (2020). DOI PubMed

Conference Abstracts

  1. K. Kalayeh, J. B. Fowlkes, P. Schmidt, J. A. Ashton-Miller and J. O. DeLancey. Mechanistic Phenotyping of SUI Using Coupled HRM and Transperineal Ultrasound. American Urogynecologic Society (AUGS) Pelvic Floor Disorders (PFD) Annual Meeting (2026). Link
  2. G. L. Heroux, J. O. DeLancey, J. LaCross, J. A. Ashton-Miller, P. Schmidt, J. B. Fowlkes and K. Kalayeh. Urethral Mobility Assessment With Handheld Ultrasound: A Feasibility Study. American Urogynecologic Society (AUGS) Pelvic Floor Disorders (PFD) Annual Meeting (2026). Link
  3. K. Kalayeh, J. B. Fowlkes, J. A. Ashton-Miller and J. O. L. DeLancey. Simultaneous Transperineal Ultrasound and High-Resolution Manometry for Mechanistic Phenotyping of Stress Urinary Incontinence. American Institute of Ultrasound in Medicine (AIUM) Annual Meeting (2026). Link
  4. K. Kalayeh, G. L. Heroux, J. LaCross, J. A. Ashton-Miller, J. O. L. DeLancey and J. B. Fowlkes. Quantifying Pelvic Floor Coordination via Automated Motion Onset Detection in Transperineal Ultrasound. American Institute of Ultrasound in Medicine (AIUM) Annual Meeting (2026). Link
  5. K. Kalayeh, J. O. L. DeLancey, J. A. Ashton-Miller, B. S. Sack and J. B. Fowlkes. Effect of Microbubble Dispersion Time on Subharmonic-Aided Pressure Estimation Performance in Bladder Pressure Measurement. American Institute of Ultrasound in Medicine (AIUM) Annual Meeting (2026). Link
  6. K. Kalayeh, J. O. L. DeLancey, J. A. Ashton-Miller, B. S. Sack and J. B. Fowlkes. Subharmonic-Aided Pressure Estimation For Bladder Pressure Measurement: An Update. American Institute of Ultrasound in Medicine (AIUM) Annual Meeting (2026). Link
  7. K. Kalayeh, W. Sui, J. Chaffin, M. Zhang, C. L. Brace, M. Grimes, P. Tripathy, T. J. Hall, I. Rosado-Mendez, J. B. Fowlkes and S. Wells. Shear Wave Elastography Reveals Distinct Prostate Transition Zone Stiffness Across Benign Prostatic Hyperplasia/Lower Urinary Tract Symptoms Phenotypes: A Feasibility Study. American Institute of Ultrasound in Medicine (AIUM) Annual Meeting (2026). Link
  8. J. Chaffin, J. B. Fowlkes, D. Mills, H. Chan, D. Yeo, A. Ajala, C. Bhushan, J. Mitra, J. Holmes, S. Wells and K. Kalayeh. An Automatic Needle Detection Method in 4D Ultrasound. American Institute of Ultrasound in Medicine (AIUM) Annual Meeting (2026). Link
  9. K. Kalayeh, W. Sui, M. Zhang, C. L. Brace, M. Grimes, P. Tripathy, T. J. Hall, I. Rosado-Mendez, J. B. Fowlkes and S. Wells. Prostate Transition Zone Stiffness Measured by Ultrasound Shear Wave Elastography Varies Across Clinical BPH/LUTS Phenotypes: A Feasibility Study. Annual Meeting of American Urological Association (AUA) (2026). Link
  10. K. Kalayeh, G. L. Heroux, J. LaCross, J. A. Ashton-Miller, J. O. L. DeLancey and J. B. Fowlkes. Automated Onset Detection Quantifies Pelvic Floor Muscle Coordination In Transperineal Ultrasound: A Proof-Of-Concept Study. Society of Urodynamics, Female Pelvic Medicine & Urogenital Reconstruction (SUFU) Annual Meeting (2026). Link
  11. K. Kalayeh, J. O. L. DeLancey, J. A. Ashton-Miller, B. S. Sack and J. B. Fowlkes. Human Bladder Pressure Measurement With Contrast-Enhanced Ultrasound: An Update. Society of Urodynamics, Female Pelvic Medicine & Urogenital Reconstruction (SUFU) Annual Meeting (2026). Link
  12. K. Kalayeh, J. B. Fowlkes, J. A. Ashton-Miller and J. O. L. DeLancey. Feasibility of SUI Phenotyping With High-Resolution Manometry and Transperineal Ultrasound. Society of Urodynamics, Female Pelvic Medicine & Urogenital Reconstruction (SUFU) Annual Meeting (2026). Link
  13. C. X. Hong, M. Masteling, K. Kalayeh, J. LaCross, J. O. L. DeLancey and L. Chen. Semi-Automated Motion Tracking of Vaginal Pessaries and Pelvic Floor Structures on Dynamic MRI. American Urogynecologic Society (AUGS) Pelvic Floor Disorders (PFD) Annual Meeting (2025). Link
  14. K. A. Hoskin, G. L. Heroux, M. Masteling, K. Kalayeh, J. B. Fowlkes, J. O. L. DeLancey and J. A. LaCross. Feasibility of Tracking Pelvic Structures in Continent and Incontinent Women. American Urogynecologic Society (AUGS) Pelvic Floor Disorders (PFD) Annual Meeting (2025). Link
  15. K. Kalayeh, J. B. Fowlkes, J. A. Ashton-Miller and J. O. DeLancey. SUI Phenotyping with High Resolution Manometry and Transperineal Ultrasound. American Urogynecologic Society (AUGS) Pelvic Floor Disorders (PFD) Annual Meeting (2025). Link
  16. C. X. Hong, M. Masteling, K. Kalayeh, J. LaCross, J. O. L. DeLancey and L. Chen. Semi-Automated Motion Tracking of Vaginal Pessaries and Pelvic Floor Structures on Dynamic MRI. International Urogynecological Association and European Urogynecological Association (IUGA/EUGA) Joint Meeting (2025). Link
  17. K. Kalayeh, J. O. L. DeLancey, H. Tai, B. S. Sack, W. W. Schultz, J. A. Ashton-Miller and J. B. Fowlkes. Evaluation of stress urinary incontinence with automated quantification of urethral mobility in transperineal ultrasound: A proof of concept. American Institute of Ultrasound in Medicine (AIUM) Annual Meeting (2025).
  18. K. Kalayeh, J. O. L. DeLancey, H. Tai, B. S. Sack, W. W. Schultz, J. A. Ashton-Miller and J. B. Fowlkes. Automated analysis of urethral mobility in transperineal ultrasound during valsalva and cough for stress urinary incontinence evaluation: A proof of concept. Society of Urodynamics, Female Pelvic Medicine & Urogenital Reconstruction (SUFU) Annual Meeting (2025).
  19. S. Yeras, K. Kalayeh, J. B. Fowlkes, A. Chen, W. W. Schultz and B. S. Sack. Assessing the Efficacy of DEFINITY, Lumason, Sonazoid, and OPTISON in Bladder Phantom Pressure SHAPE Measurements: A Necessary Step Toward Clinical Evaluation. American Institute of Ultrasound in Medicine UltraCon (2024). Link
  20. H. Tai, K. Kalayeh, J. O. L. DeLancey, J. A. Ashton-Miller and J. B. Fowlkes. Urethra Tissue Characterization using Angle Dependent Multiparametric Ultrasound Imaging. American Institute of Ultrasound in Medicine (AIUM) UltraCon (2024). Link
  21. K. Kalayeh, J. B. Fowlkes, M. Zhang, S. N. Ambani, W. W. Schultz and B. S. Sack. Evaluation of Renal Obstruction with Dynamic Contrast-Enhanced Ultrasound. American Institute of Ultrasound in Medicine (AIUM) UltraCon (2024). Link
  22. K. Kalayeh, J. B. Fowlkes, J. O. L. DeLancey, J. A. Ashton-Miller, W. W. Schultz and B. S. Sack. Catheter-Free Pressure Measurements in Human Bladder With Subharmonic-Aided Pressure Estimation (SHAPE): A proof of Concept. American Institute of Ultrasound in Medicine UltraCon (2024). Link
  23. K. Kalayeh, J. B. Fowlkes, P. Schmidt, H. Tai, W. W. Schultz, B. S. Sack, J. A. Ashton-Miller and J. O. L. DeLancey. Evaluation of Urinary Incontinence by Automated Quantification of Urethral Mobility in Ultrasound Imaging. American Institute of Ultrasound in Medicine (AIUM) UltraCon (2024). Link
  24. K. Kalayeh, J. B. Fowlkes, P. Schmidt, H. Tai, W. W. Schultz, B. S. Sack, J. A. Ashton-Miller and J. O. L. DeLancey. Automated Quantification Of Ultrasound Imaging: A New Horizon In Urethral Mobility Assessment. Annual Meeting of Society of Urodynamics, Female Pelvic Medicine & Urogenital Reconstruction (SUFU) (2024).
  25. K. Kalayeh, J. B. Fowlkes, J. O. L. DeLancey, J. A. Ashton-Miller, W. W. Schultz and B. S. Sack. Human Bladder Pressure Measurement With Contrast-Enhanced Ultrasound: A Proof Of Concept. Annual Meeting of Society of Urodynamics, Female Pelvic Medicine & Urogenital Reconstruction (SUFU) (2024).
  26. K. Kalayeh, S. N. Ambani, J. B. Fowlkes, M. Zhang, W. W. Schultz and B. S. Sack. Role of contrast enhanced ultrasound in evaluating obstruction resolution after pyeloplasty. Annual Meeting of American Urological Association (AUA) (2024). DOI
  27. K. Kalayeh, S. N. Ambani, J. B. Fowlkes, M. Zhang, W. W. Schultz and B. S. Sack. Dynamic contrast-enhanced ultrasound can diagnose kidney obstruction. Annual Meeting of American Urological Association (AUA) (2024). DOI
  28. K. Kalayeh, J. B. Fowlkes, J. O. L. DeLancey, J. A. Ashton-Miller, W. W. Schultz and B. S. Sack. One step closer to a catheter-free pressure flow study: Subharmonic-aided pressure estimation of human bladders using contrast ultrasonography. Annual Meeting of American Urological Association (AUA) (2024). DOI
  29. J. LaCross, K. Kalayeh, J. B. Fowlkes, J. A. Ashton-Miller and J. O. L. DeLancey. Assessing the Feasibility of a Software-Augmented Method for Analyzing Pelvic Floor Kinematics via 2D Transperineal Ultrasound Imaging. 2nd Annual Reproducible Rehabilitation Research Summit (2024).
  30. J. LaCross, K. Kalayeh, J. B. Fowlkes, J. A. Ashton-Miller and J. O. L. DeLancey. Development of a Software-Augmented Non-Invasive Movement Analysis of Pelvic Floor Motion Using Two-Dimensional Transperineal Ultrasound Imaging. Kidney, Urology and Hematology Research Training Inaugural National Meeting (2024).
  31. W. W. Schultz, K. Kalayeh, H. Xie, J. B. Fowlkes and B. S. Sack. Practically perfect peristaltic pump performance. Annual Meeting of the American Physical Society (APS), Division of Fluid Dynamics (DFD) (2024).
  32. H. Xie, W. W. Schultz, K. Kalayeh, J. B. Fowlkes and B. S. Sack. Inverse Method for Ureteral Peristalsis Determination From Pressure Measurements. Annual Meeting of the American Physical Society (APS), Division of Fluid Dynamics (DFD) (2024).
  33. H. Tai, K. Kalayeh, J. O. L. DeLancey, J. A. Ashton-Miller and J. B. Fowlkes. Noninvasive Assessment of Urethral Tissue Using Multiparametric Ultrasound Imaging. Gordon Research Conference (2024). Link
  34. K. Kalayeh, J. B. Fowlkes, P. Schmidt, H. Tai, W. W. Schultz, B. S. Sack, J. A. Ashton-Miller and J. O. L. DeLancey. Automated Quantification of Pelvic Floor Mobility in Transperineal Ultrasound for Urinary Incontinence Evaluation. Gordon Research Conference (2024). Link
  35. K. Kalayeh, H. Xie, J. B. Fowlkes, W. W. Schultz and B. S. Sack. Ureteral Wall Longitudinal Motion During Peristalsis Restricts Reflux. Annual Meeting of Society of Urodynamics, Female Pelvic Medicine & Urogenital Reconstruction (SUFU) (2023). Link
  36. K. Kalayeh, H. Xie, J. B. Fowlkes, W. W. Schultz and B. S. Sack. Ureteral Peristalsis Longitudinal Motion Minimizes Reflux. Annual Meeting of American Urological Association (AUA) (2023). DOI
  37. K. Kalayeh, J. B. Fowlkes, A. Chen, S. Yeras, M. L. Fabiilli, W. W. Schultz and B. S. Sack. Performance of Commercial Ultrasound Contrast Agents for Bladder Pressure Measurement. American Institute of Ultrasound in Medicine (AIUM) UltraCon (2023). Link
  38. K. Kalayeh, J. B. Fowlkes, P. Schmidt, H. Tai, B. S. Sack, J. A. Ashton-Miller and J. O. L. DeLancey. Near Real-Time Automated Quantification of Urethral Mobility During Ultrasound Imaging. American Urogynecologic Society (AUGS) Pelvic Floor Disorders (PFD) Annual Meeting (2023). Link
  39. K. Kalayeh, J. B. Fowlkes, A. Chen, S. Yeras, M. L. Fabiilli, W. W. Schultz and B. S. Sack. Catheter-Free Bladder Phantom Pressure Measurement with Contrast-Enhanced Ultrasound. Annual Meeting of Society of Urodynamics, Female Pelvic Medicine & Urogenital Reconstruction (SUFU) (2023). Link
  40. K. Kalayeh, J. B. Fowlkes, A. Chen, S. Yeras, M. L. Fabiilli, W. W. Schultz and B. S. Sack. Catheter-free Bladder Phantom Pressure Measurement-Comparison Study of Commercial Ultrasound Contrast Agents. Annual Meeting of American Urological Association (AUA) (2023). DOI
  41. K. Kalayeh, J. B. Fowlkes, J. Claflin, M. L. Fabiilli, W. W. Schultz and B. S. Sack. Application of Lipid-Shell Microbubbles in Cystometrogram–Handling and Bladder Pressure Estimation. American Institute of Ultrasound in Medicine (AIUM) Annual Meeting (2022). Link
  42. K. Kalayeh, J. B. Fowlkes, J. Claflin, M. L. Fabiilli, W. W. Schultz and B. S. Sack. Bladder Pressure Estimation Using Subharmonic Signal Scattered by Ultrasound Contrast Agents. Radiological Society of North America (RSNA) Scientific Assembly and Annual Meeting (2021). Link
  43. K. Kalayeh, J. B. Fowlkes, J. Claflin, M. L. Fabiilli, W. W. Schultz and B. S. Sack. Benchtop Bladder Phantom Pressure Estimation Using Ultrasound Contrast Agents. Annual Meeting of American Urological Association (AUA) (2021). DOI
  44. K. Kalayeh, J. B. Fowlkes, W. W. Schultz and B. S. Sack. Urinary Reflux. Annual Meeting of the American Physical Society (APS), Division of Fluid Dynamics (DFD) (2020). Link
  45. K. Kalayeh, J. B. Fowlkes, W. W. Schultz and B. S. Sack. Dismembering The Ureterovesical Junction: A Computational Analysis Of The 5:1 Ureteral Length-To-Diameter Ratio. Joint Meeting of ESPU-SPU (2020). Link