Titles and Education

1. Diplomate American College of Veterinary Radiology (diagnostic imaging). (DipACVR)
2. Diplomate of the American College of Veterinary Radiology (radiation oncology) (DipACVR)
3. Fellow Australian and New Zealand College of Veterinary Scientists (medical oncology) (FANZCVS) 
4. Membership of the Australian and New Zealand College of Veterinary Scientists (small animal medicine) (MANZCVS)
5. Bachelor of Veterinary Science (BVSc)
   
   

Research

Responsibilities

• Tenure track faculty in Radiation Oncology 
• Faculty in Diagnotic Imaging. 

Clinical Interests

I work clinically as Faculty in both the Radiation Oncology and Diagnostic Imaging

Graduate Training

Certification

• Diplomate American College of Veterinary Radiology (radiation oncology) - 2026
• Fellow Australian and New Zealand College of Veterinary Scientists (medical oncology) - 2016
• Diplomate American College of Veterinary Radiology (radiation oncology) - 2014
• Membership of the Australian and New Zealand College of Veterinary Scientists, Small Animal Internal Medicine (MANZCVS) - 2012

Training

• Diagnostic Imaging Residency, University of Wisconsin - Madison - 2023-2026
• Radiation Oncology Residency, University of Wisconsin – Madison - 2012-2014              
• Medical Oncology Residency, Small Animal Specialist Hospital, Sydney - 2010-2012              
• Internship (Oncology/Medicine),Veterinary Specialist Centre, Sydney - 2008-2009
• Bachelor of Veterinary Science (Hons 1), University Medal, The University of Sydney - 2004-2008

Recent Publications

1. Poirier VJ, Meier V, Turek M, Christensen N, Bowal J, Ponzini MD, Keller SM. Do Pre-Treatment Biopsy Characteristics Predict Early Tumour Progression in Feline Diffuse Large B Cell Nasal Lymphoma Treated With Radiotherapy? Vet Comp Oncol. 2024 Dec 4. doi: 10.1111/vco.13032. Online ahead of print.
2. Rancilio NJ, Murakami K, Harm T and Christensen N. Radiation therapy communication: Retreatment of multiple histologically confirmed oligodendroglioma drop metastasis with stereotactic radiotherapy in a dog. Vet Radiol Ultrasound. Epub 2 October 2024. https://doi.org/10.1111/vru.13454
3. Swanton WE, Christensen N, Schroeder C. Rectus sheath block results in greater cranial-caudal spread whereas transversus abdominis plane block results in greater lateral spread as assessed by computed tomography in dogs. Am J Vet Res. 2024 Jul 30;85(10):ajvr.24.04.0106. doi: 10.2460/ajvr.24.04.0106.Print 2024 Oct 1.
4. Van Asselt N and Christensen N. Initial treatment experience obtained with the real-time predictive motion tracking radiotherapy platform Synchrony: A pilot study. Vet Radiol Ultrasound. 2024 Aug 19. doi: 10.1111/vru.13421. Online ahead of print.
5. Kaufman DB, Forrest LJ, Fechner J, Post J, Coonen J, Haynes LD, Haynes WJ, Christensen N, Zhong W, Little CJ, D'Alessandro A, Fernandez L, Brunner K, Jensen K, Burlingham WJ, Hematti P, Strober S. Helical TomoTherapy Total Lymphoid Irradiation and Hematopoietic Cell Transplantation for Kidney Transplant Tolerance in Rhesus Macaques. Transpl Int. 2023 
6. Van Asselt N, Randhawa K, Kvasnica, Ferris W, Christensen N. Evaluation of mega-voltage CT images for completed radiotherapy treatments for dogs and cats reveals uncommon but potentially consequential dose deviation in thoracic and abdominal tumors. Vet Radiol Ultrasound, 2023;64:149–154.
7. Smedley R, Bongiovanni L, Bacmeister C, Clifford C, Christensen N, Dreyfus J, Gary J, Pavuk A, Rowland P, Swanson C, Tripp C, Woods P, Bergman P. Diagnosis and Histopathologic Prognostication of Canine Melanocytic Neoplasms: A Consensus of the Oncology-Pathology Working Group. Vet Comp Oncol. 2022. Epub  doi: 10.1111/vco.12827. 
8. Stevens A, Vail DM, Forrest LJ, Christensen NI, Turek MM. Definitive-Intent Intensity Modulated Radiotherapy For Modified-Adams’ Stage 4 Canine Sinonasal Cancer: A Retrospective Study Of 29 Cases (2011-2017).  Vet Radiol Ultrasound. 2020:61(6):718-25
9. Van Asselt N, Meier V, Rohrer-Bley C, Laliber S, Poirier V, Desai N, Chen Y, Turek MM, Christensen NI. Definitive-Intent Intensity Modulated Radiation Therapy Provides A Similar Outcome as Definitive-Intent Three-Dimensional Conformal Radiation Therapy For Treatment Of Primary Brain Tumors In Dogs: A Multi-Institutional Retrospective Study. Vet Radiol Ultrasound. 2020:61(4):481-89
10. Tsimbas K, Turek M, Christensen N, Vail DM, Forrest L. Short survival time following palliative-intent hypofractionated radiotherapy for non-resectable canine thyroid carcinoma: A retrospective analysis of 20 dogs. Vet Radiol Ultrasound. 2019;60(1):93-99.
11. Dunfield EM, Turek MM, Buhr KA, Christensen NI. A Survey of Stereotactic Radiation Therapy in Veterinary Medicine. Vet Radiol Ultrasound. 2018;59(6):786-795
12. Sheehan NK, Rylander H, Christensen N, Nafe LA. Meningeal dissemination of a pituitary carcinoma to the cauda equina in a dog.Can Vet J. 2017;58(8):839-841
13. Christensen NI, Forrest LJ, White PJ, Henzler M, Turek MM. Single Institution Variability in Intensity Modulated Radiation Target Delineation For Canine Nasal Neoplasia. Vet Radiol Ultrasound. 2016;57(6):639-645.
14. MacDiarmid JA, Langova V, Bailey D, Pattison ST, Pattison SL, Christensen N, Armstrong LR, Brahmbhatt VN, Smolarczyk K, Harrison MT, Costa M, Mugridge NB, Sedliarou I, Grimes NA, Kiss DL, Stillman B, Hann CL, Gallia GL, Graham RM, Brahmbhatt H. Targeted Doxorubicin Delivery to Brain Tumors via Minicells: Proof of Principle Using Dogs with Spontaneously Occurring Tumors as a Model. PLoS One. 2016:6;11(4): epub.  
15. Barden JA, Gidley-Baird A, Chen Teh L, Rajasekariah G-H, Pedersen J, Christensen N, Spielman D, Ashley DM. Therapeutic Targeting of the Cancer-Specific Biomarker nfP2X7. J Clin Cell Immunol. 2016:7(3):432-440

16. Saenz DL, Yan Y, Christensen N, Henzler MA, Forrest LJ, Bayouth JE, Paliwal BR. Characterization of a 0.35T MR system for phantom image quality stability and in vivo assessment of motion quantification. J App Clin Med Phys. 2015:16(6):30-40. 

17. Brown PM, Christensen NI, Lanogova V. Long-term survival of a dog with biclonal multiple myeloma. Aust Vet Pract. 2014:44(2):621-625.

18. Christensen NI, Brain PH, Langova V, Flory AB. Vaginal discharge in a spayed dog with multiple distinct malignancies. Aust Vet J. 2013:91(7):287-91.

19. Christensen NI, Culvenor J, Langova V. Fluoroscopic stent placement for the relief of malignant urethral obstruction in a cat. Aust Vet J. 2010:88(12):478-82.

20. Christensen NI, Canfield P, Martin P, Krockenberger M, Spielman D, Bosward K. Cytopathological and histopathological diagnosis of canine splenic disorders. Aust Vet J. 2009:87(5):175-81.