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Photo of R Alfredo Siochi

R Alfredo Siochi

Adj Clinical Assoc Professor,  Radiation Oncology

Contact Information

Phone: +1 319 353 8979
Email: ralfredo-siochi@uiowa.edu


BS, Physics, Ateneo de Mainila University, Quezon City, Philippines
PhD, Physics, Virginia Tech, Blacksburg, Virginia


Primary: Radiation Oncology

Centers and Program Affiliations

Research Interests

MeSH Terms from Publications

Research Summary

  1. Fluence source models and fluence calculation algorithm development
  2. Model based segmentation and 4D treatment planning
  3. 4D cone beam reconstruction from daily 3D cone beam data
  4. Adaptive phase-based gating 4DRT
  5. 4D MR reconstruction
  6. Radiotherapy Safety Engineering and Process Improvement

Recent Publications

Show publications
    • Siochi RA. Modifications to the Imfast Leaf Sequencing Optimization Algorithm. Med Phys. 2004;31(12):3267-3278. PMID: 15651609
    • Siochi RA. Variable Depth Recursion Algorithm for Leaf Sequencing. Med Phys. 2007;34(2):664-672. PMID: 17388184
    • Siochi RA. A Projection Point Tracking Method for Gated 4drt Validation. Med Phys. 2007;34:2528.
    • Siochi RA, Kim Y, Bhatia S. Tumor Control Probability (Tcp) Reduction in Phase Gated Rt Treatments of Non-Small Cell Lung Cancer (Nsclc) Tumors with Motion in Excess of Planned Motion. Int J Radiat Oncol Biol Phys. 2008;72:S49.
    • Siochi RA. Optimized Removal of the Tongue-and-Groove Underdose Via Constrained Partial Synchronization and Variable Depth Recursion. Phys Med Biol. 2009;54(5):1369-1381. PMID: 19204387
    • Siochi RA. Deriving Motion from Megavoltage Localization Cone Beam Computed Tomography Scans. Phys Med Biol. 2009;54(13):4195-4212. PMID: 19521012
    • Flynn RT, Hartmann J, Bani-Hashemi A, Nixon E, Alfredo R, Siochi C, Pennington EC, Bayouth JE. Dosimetric Characterization and Application of an Imaging Beam Line with a Carbon Electron Target for Megavoltage Cone Beam Computed Tomography. Med Phys. 2009;36(6):2181-2192. PMID: 19610307
    • Siochi RA. Leakage Reduction for a Commercial Mini-Multileaf. J Appl Clin Med Phys. 2009;10(2).
    • Siochi RA, Balter P, Bloch CD, Bushe HS, Mayo CS, Curran BH, Feng W, Kagadis GC, Kirby TH, Stern RL. Information Technology Resource Management in Radiation Oncology. J Appl Clin Med Phys. 2009;10(4):3116. PMID: 19918239
    • Siochi RA, Pennington EC, Waldron TJ, Bayouth JE. Radiation Therapy Plan Checks in a Paperless Clinic. J Appl Clin Med Phys. 2009;10(1):2905. PMID: 19223840
    • Chen M, Siochi RA. Diaphragm Motion Quantification in Megavoltage Cone-Beam Ct Projection Images. Med Phys. 2010;37(5):2312-2320. PMID: 20527565
    • Chen M, Siochi RA. Feasibility of Using Respiratory Correlated Mega Voltage Cone Beam Computed Tomography to Measure Tumor Motion. J Appl Clin Med Phys. 2011;12(2):3473. PMID: 21587196
    • Siochi RA, Balter P, Bloch CD, Santanam L, Blodgett K, Curran BH, Engelsman M, Feng W, Mechalakos J, Pavord D, Simon T, Sutlieff S, Zhu XR. A Rapid Communication from the Aapm Task Group 201: Recommendations for the Qa of External Beam Radiotherapy Data Transfer. Aapm Tg 201: Quality Assurance of External Beam Radiotherapy Data Transfer. J Appl Clin Med Phys. 2011;12(1):3479. PMID: 21330992