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Dr. Guillaume Landry

Dr. Guillaume Landry

Scientific Staff Member (Akademischer Rat)


Imaging applied to proton therapy


Department of Medical Physics
Faculty of Physics
Ludwig-Maximilians-Universität München (LMU Munich)
Room 125
Am Coulombwall 1
85748 Garching

Room: 126
Phone: +49(0)89 289-14022
Fax: +49-(0)89 289-14072

Website: http://www.researchgate.net/profile/Guillaume_Landry

Further Information



2009    M.Sc., Medical Radiation Physics, McGill University, Canada

2014    Ph.D. cum laude*, Medical Physics, Maastricht University, The Netherlands

*Highest distinction in the Netherlands


D.C. Hansen, G. Landry, F. Kamp, M. Li, C. Belka, K. Parodi, C. Kurz. ScatterNet: a convolutional neural network for cone‐beam CT intensity correction. Med Phys (2018) Sep 10

G. Landry, G. Dedes, M. Pinto, K. Parodi. Imaging and particle therapy. In “Advances in Particle Therapy”, Editors Manjit Dosanjh and Jacques Bernie, Taylor & Francis, 2018.

B. van der Heyden, , L.E.J.R. Schyns, M. Podesta, A. Vaniqui, I.P. Almeida, G. Landry, F. Verhaegen. VOXSI: A voxelized single- and dual-energy CT scenario generator for quantitative imaging. Phys Imaging Radiat Oncol (2018) vol. 6 pp. 47-52

G. Dedes, R.P. Johnson, M. Pankuch, N. Detrich, W.M.A. Pols, S. Rit, R.W. Schulte, K. Parodi, G. Landry. Experimental fluence modulated proton computed tomography by pencil beam scanning. Med Phys (2018) vol 45 (7) pp. 3287-3296

W. van Elmpt, G. Landry. Quantitative computed tomography in radiation therapy: A mature technology with a bright future. Phys Imaging Radiat Oncol (2018) vol. 6 pp. 12-3

I.P. Almeida, L.E. Schyns, A. Vaniqui, B. van der Heyden, G. Dedes, A.F. Resch, F. Kamp, J.D. Zindler, K. Parodi, G. Landry*, F. Verhaegen*. Monte Carlo proton dose calculations using a radiotherapy specific dual-energy CT scanner for tissue segmentation and range assessment. Phys Med Biol (2018) vol 63 (11) pp. 15008
*equally contributed

J. Hofmaier, J. Haehnle, C. Kurz, G. Landry, C. Maihöfer, L. Schüttrumpf, P. Süss, K. Teichert, M. Söhn, N. Traulsen, C. Brachmann, F. Weiler, C. Thieke, K. Küfer, C. Belka, K. Parodi, F.Kamp. Multi-criterial patient positioning based on dose recalculation on scatter-corrected CBCT images. Radiother Oncol (2017) vol. 125 (3) pp.464-469

M. Maspero, C .Van den Berg, G. Landry, C. Belka, K. Parodi, P. Seevinck, B. Raaymakers, C. Kurz. Feasibility of MR-only proton dose calculations for prostate cancer radiotherapy using a commercial pseudo-CT generation method. Phys Med Biol (2017) vol. 62 (24) pp. 9159

I.P. Almeida*, G. Landry*, G. Dedes, R. Patel, M. Pankuch, G. Coutrakon, R Schulte, F. Verhaegen, K. Parodi, J.C. Roeske. Evaluating clinical stopping power estimation from a radiotherapy dual energy CT scanner. Acta Phys Pol B (2017) vol 48 (10) pp. 1619
*equally contributed

C. Zöllner, S. Rit, C. Kurz, G. Vilches-Freixas, F. Kamp, G. Dedes, C. Belka, K. Parodi, G. Landry. Decomposing a prior-CT-based cone-beam CT projection correction algorithm into scatter and beam hardening components. Phys Imaging Radiat Oncol (2017) vol 3 pp.49-52

C. Kurz, G. Landry, A. F. Resch, G. Dedes, F. Kamp, U. Ganswindt, C. Belka, B.W. Raaymakers, K. Parodi. A Monte-Carlo study to assess the effect of 1.5T magnetic fields on the overall robustness of pencil-beam scanning proton radiotherapy plans for prostate cancer. Phys Med Biol (2017) vol. 62 (21) pp. 8470

G. Dedes, L. De Angelis, S. Rit, D. Hansen, C. Belka, V. Bashkirov, R.P. Johnson, G. Coutrakon, K.E. Schubert, R.W. Schulte, K. Parodi, G. Landry. Application of fluence field modulation to proton computed tomography for proton therapy imaging. Phys Med Biol (2017) vol. 62 (15) pp 6026

A. Resch, G. Landry, F. Kamp, G. Cabal, C. Belka, J.J. Wilkens, K. Parodi, G. Dedes. Quantification of the uncertainties of a biological model and their impact on variable RBE proton treatment plan optimization. Phys Med (2017) vol. 36 pp 91-102.

B.Bernt*, G. Landry*, F. Schwarz, T. Tessonnier, F. Kamp, G. Dedes, C. Thieke, M. Wuerl, C. Kurz, U. Ganswindt, F. Verhaegen, J. Debus, C. Belka, W. Sommer, M. Reiser, J. Bauer, K. Parodi. Application of single- and dual-energy CT brain tissue segmentation to PET monitoring of proton therapy. Phys Med Biol (2017) vol. 62 (6) pp. 2427
*equally contributed

R. Schnerr, A.N. de Jong, G. Landry, C.R.L.P.N. Jeukens, R. Wierts. Monte Carlo simulations of ceiling scatter in nuclear medicine: 99mTc, 131I and 18F. Med Phys (2017) vol. 44 pp. 1113–1119

I.P. Almeida, L.E.J.R. Schyns, M.C. Oeller, W. van Elmpt, K. Parodi, G. Landry, F. Verhaegen. Dual Energy CT quantitative imaging: a comparison study between Twin-Beam and Dual-Source CT scanners. Med Phys (2017) vol. 44 (1) pp. 171-179

S. Meyer, C. Gianoli, L. Magallanes, B. Knopp, T. Tessonnier, G. Landry, G. Dedes, B. Voss, K. Parodi. Comparative Monte Carlo study on the performance of integration- and list-mode detector configurations for carbon ion computed tomography. Phys Med Biol (2017) vol. 62 (3) pp.1096-1112

J. Haehnle, P. Suess, G. Landry, K. Teichert, L. Hille, J. Hofmaier, D. Nowak, F. Kamp, M. Reiner, C. Thieke, U. Ganswindt, C. Belka, K. Parodi, K.H. Küfer, C. Kurz. A novel method for interactive multi-objective dose-guided patient positioning. Phys Med Biol (2017) vol. 62 (1) pp.165-185

L.E.R. Schyns, I.P. Almeida, S.J. va Hoof, B. Descamps, C. Vanhove, G. Landry, P.V. Granton, F. Verhaegen. Optimizing dual energy cone beam CT protocols for preclinical imaging and radiation research. Br J Radiol (2016) vol. 89 20160480

C. Kurz, F. Kamp, Y.K. Park, C. Zoellner, S. Rit, D. Hansen, M. Podesta, G.C. Sharp, M. Li, M. Reiner, J. Hofmaier, S. Neppl, C. Thieke, R. Nijhuis, U. Ganswindt, C. Belka, B.A. Winey, K. Parodi, G. Landry. Investigating deformable image registration and scatter correction for CBCT-based dose calculation in adaptive IMPT. Med Phys (2016) vol. 43 (10) pp. 5635-46

B. Reniers, G. Janssens, J.O. de Xivry, G. Landry, F. Verhaegen. Dose distribution for gynecological brachytherapy with dose accumulation between insertions: Feasibility study. Brachytherapy (2016) vol. 15 (4) pp.504-513

C. Kurz, R. Nijhuis, M. Reiner, U. Ganswindt, C. Thieke, C. Belka, K. Parodi, G. Landry, Feasibility of automated proton therapy plan adaptation for head and neck tumors using cone beam CT images. Radiat Oncol (2016) vol. 11 (1) pp.1-9

W. van Elmpt, G.Landry, M. Das, F. Verhaegen. Dual Energy CT in Radiotherapy: Current Applications and Future Outlook. Radiotherapy and Oncology. Radiother Oncol (2016) vol. 119 (1) pp. 137-144

N. Hudobivnik, F. Schwarz, T. Johnson, L. Agolli, G. Dedes, T. Tessonnier, F. Verhaegen, C. Thieke, C. Belka, W. Sommers, K. Parodi, G. Landry. Comparison of proton therapy treatment planning for head tumors with a pencil beam algorithm on dual and single energy CT images. Medical Physics (2016) vol. 43 (1) pp. 495-504

*S. Schmid, *G. Landry, C. Thieke, F. Verhaegen, U. Ganswindt, C. Belka, K. Parodi, G. Dedes. Monte Carlo study on the sensitivity of prompt gamma imaging to proton range variations due to interfractional changed in prostate cancer patients. Phys Med Biol (2015) vol. 60 (24) pp. 9329-9347
*equally contributed 

*G. Landry, *M. Gaudreault, W. van Elmpt, J.E. Wildberger, F. Verhaegen. Improved dose calculation accuracy for low energy brachytherapy by optimizing dual energy CT imaging protocols for noise reduction using sinogram affirmed iterative reconstruction. Z Med Phys (2016) vol. 26 (1) pp. 75-87
*equally contributed 

D. Hansen, J. Seco, T. Sangild, T.S. Sorensen, J.B.B. Petersen, J.E. Wildberger, F. Verhaegen, G. Landry. A simulation study on proton CT stopping power accuracy using dual energy CT scans as benchmark. Acta Oncologica (2015) vol. 54 (9) pp. 1638-1642

C. Kurz, G. Dedes, A. Resch, M. Reiner, U. Ganswindt, R. Nijhuis, C. Thieke, C. Belka, K. Parodi, G Landry. Comparing cone-beam CT intensity correction methods for dose recalculation in adaptive intensity modulated photon and proton therapy for head and neck cancer. Acta Oncologica (2015) vol. 54 (9) pp. 1651-1657

G. Landry et al. Investigating CT to CBCT image registration for head and neck proton therapy as a tool for daily dose recalculation. Medical physics (2015) vol. 42 (3) pp. 1354-66 

E. Adolfsson, S. White, G. Landry, E Lund, H Gustafsson, F Verhaegen, B Reniers, ÅC Tedgren, GA Carlsson. Measurement of absorbed dose to water around an electronic brachytherapy source. Comparison of two dosimetry systems: lithium formate EPR dosimeters and radiochromic EBT2 film. Physics in Medicine & Biology (2015) vol. 60 (9) pp. 3869-3882

G. Landry et al. Phantom based evaluation of CT to CBCT image registration for proton therapy dose recalculation. Physics in medicine and biology (2015) vol. 60 (2) pp. 595-613


G. Landry, M.R. Rivard, J.F. Williamson, F. Verhaegen, Monte Carlo methods and
applications for brachytherapy dosimetry and treatment planning. In “Monte Carlo
Techniques in Radiotherapy”, Editors Joao Seco and Frank Verhaegen, Taylor & Francis,

G. Fonseca, G.Landry, S. White, M. D’Amours, H. Yoriyaz, L. Beaulieu, B. Reniers, F.
Verhaegen. The use of tetrahedral mesh geometries in Monte Carlo simulation of
applicator based brachytherapy dose distributions. Physics in medicine and biology
(2014) vol. 59 (19) pp. 5921-5935

M. Gaudreault, B. Reniers, G. Landry, F. Verhaegen, L. Beaulieu. Dose perturbation due
to catheter materials in high-dose-rate interstitial 192Ir brachytherapy. Brachytherapy

F. Janssen, G. Landry, Lopes Patricia Cambraia, Georgios Dedes, Julien Smeets, Dennis
Schaart, Katia Parodi and Frank Verhaegen. Factors influencing the accuracy of beam
range estimation in proton therapy using prompt gamma emission. Physics in medicine
and biology (2014) vol. 59 (15) pp.4427

S. White, G. Landry, G. Fonseca, R. Holt, T. Rusch, L. Beaulieu, F. Verhaegen, B.
Reniers. Comparison of TG-43 and TG-186 in breast irradiation using a low energy
electronic brachytherapy source. Medical physics (2014) vol. 41 (6) pp. 061701

G. Fonseca, G. Landry, B. Reniers, A. Hoffmann, R. Rubo, P.C. Antunes, H. Yoriyaz, F.
Verhaegen. The contribution of transit dose for 192Ir HDR brachytherapy treatments.
Physics in medicine and biology (2014) vol. 59 pp.1831-1844

G. Landry, F. deBlois, F. Verhaegen. ImaSim, a software tool for basic education of
medical x-ray imaging in radiotherapy and radiology. Frontiers in physics (2013) vol. 1

G. Landry, J. Seco, M. Gaudreault, F. Verhaegen. Deriving effective atomic numbers
from DECT based on a parameterization of the ratio of high and low linear attenuation
coefficients. Physics in medicine and biology (2013) vol. 58 (19) pp. 6851-66

G. Landry, K. Parodi, J.E. Wildberger, F. Verhaegen. Deriving concentrations of oxygen
and carbon in human tissues using single- and dual-energy CT for ion therapy
applications. Physics in medicine and biology (2013) vol. 58 (15) pp. 5029-5048

S. Enger, G. Landry, M. D’Amours, F. Verhaegen, L. Beaulieu, M. Asai, J. Perl.
Layered Mass Geometry: a novel technique to overlay seed or applicator onto patient
geometry in Geant4 brachytherapy simulations. Physics in medicine and biology (2012)
vol. 57 (19) pp. 6269-77

P.V. Granton, M. Podesta, G. Landry, S. Nijsten, G. Bootsma, F. Verhaegen. A
combined dose calculation and verification method for a small animal precision irradiator
based on onboard imaging. Medical physics (2012) vol. 39 (7) pp. 4155

S. J. van Hoof, P.V. Granton, G. Landry, M. Podesta, F. Verhaegen. Evaluation of a
novel triple-channel radiochromic film analysis procedure using EBT2. Physics in
medicine and biology (2012) vol. 57 (13) pp. 4353-4368

S White, G. Landry, F. Van Gils, F. Verhaegen, B. Reniers. Influence of trace elements
in human tissue in low-energy photon brachytherapy dosimetry. Physics in medicine and
biology (2012) vol. 57 (11) pp. 3585-96

H. Afsharpour, G. Landry, M. D’Amours, S. Enger, B. Reniers, E. Poon, J.F. Carrier, F.
Verhaegen, L. Beaulieu. ALGEBRA: ALgorithm for the heterogeneous dosimetry based
on GEANT4 for BRAchytherapy. Physics in medicine and biology (2012) vol. 57 (11)
pp. 3273-80

B. Reniers, G. Landry, R. Eichner, A. Hallil, F. Verhaegen. In vivo dosimetry for
gynaecological brachytherapy using a novel position sensitive radiation detector:
Feasibility study. Medical physics (2012) vol. 39 (4) pp. 1925-35

G. Landry, B. Reniers, L. Lutgens, L. Murrer, H. Afsharpour, D. De Haas-Kock, P.
Visser, F. Van Gils, F. Verhaegen. Dose reduction in LDR brachytherapy by implanted
prostate gold fiducial markers. Medical physics (2012) vol. 39 (3) pp. 1410-7

H. Afsharpour, B. Reniers, G. Landry, J.P. Pignol, B.M. Keller, F. Verhaegen, L.
Beaulieu. Consequences of dose heterogeneity on the biological efficiency of (103)Pd
permanent breast seed implants. Physics in medicine and biology (2012) vol. 57 (3) pp.

H. Afsharpour, G. Landry, B. Reniers, J.P. Pignol, L. Beaulieu, F. Verhaegen. Tissue
modeling schemes in low energy breast brachytherapy. Physics in medicine and biology
(2011) vol. 56 (22) pp. 7045-7060

G. Landry, P. Granton, B. Reniers, M.C. Ollers, L. Beaulieu, J.E. Wildberger, F.
Verhaegen. Simulation study on potential accuracy gains from dual energy CT tissue
segmentation for low-energy brachytherapy Monte Carlo dose calculations. Physics in
medicine and biology (2011) vol. 56 pp. 6257-78

G. Landry, B. Reniers, P.V. Granton, B. van Rooijen, L. Beaulieu, J.E. Wildberger, F.
Verhaegen. Extracting atomic numbers and electron densities from a dual source dual
energy CT scanner: experiments and a simulation model. Radiotherapy and oncology :
journal of the European Society for Therapeutic Radiology and Oncology (2011) vol. 100
(3) pp. 375-9

G. Landry, B. Reniers, J.P. Pignol, L. Beaulieu, F. Verhaegen. The difference of scoring
dose to water or tissues in Monte Carlo dose calculations for low energy brachytherapy
photon sources. Med Phys (2011) vol. 38 (3) pp. 1526-33

G. Landry, B. Reniers, L. Murrer, L. Lutgens, E.B. Gurp, J.P. Pignol, B. Keller, L.
Beaulieu, F. Verhaegen. Sensitivity of low energy brachytherapy Monte Carlo dose
calculations to uncertainties in human tissue composition. Medical physics (2010) vol. 37
(10) pp. 5188-98

G. Poludniowski, G. Landry, F. DeBlois, P.M. Evans, F. Verhaegen. SpekCalc: a
program to calculate photon spectra from tungsten anode x-ray tubes. Physics in
medicine and biology (2009) vol. 54 (19) pp. N433-8

T. Benmessaoud, G. Landry, J Gariepy, B. Ramamoorthy, P. Ashrit, A. Hache. High
contrast optical switching in vanadium dioxide thin films. Optics Communications (2008)
vol. 281 (24) pp. 6024-6027