28 – 30 mai, 2015, Montréal, Québec PROSTATE CANCER PLANNING BENEFITS OF MRI FOR EXTERNAL BEAM...
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Transcript of 28 – 30 mai, 2015, Montréal, Québec PROSTATE CANCER PLANNING BENEFITS OF MRI FOR EXTERNAL BEAM...
![Page 1: 28 – 30 mai, 2015, Montréal, Québec PROSTATE CANCER PLANNING BENEFITS OF MRI FOR EXTERNAL BEAM AND BRACHYTHERAPY LINE DESROSIERS MARIE-CLAUDE GAUVIN.](https://reader034.fdocuments.net/reader034/viewer/2022052510/56649ea75503460f94baaa51/html5/thumbnails/1.jpg)
28 – 30 mai, 2015, Montréal, Québec
PROSTATE CANCER
PLANNING BENEFITS OF MRI FOR EXTERNAL BEAM AND BRACHYTHERAPY
LINE DESROSIERSMARIE-CLAUDE GAUVIN
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DISCLOSURE STATEMENT: NO CONFLICT OF INTEREST
May 28 – 30, 2015, Montréal, Québec
I do not have an affiliation, financial or otherwise, with a pharmaceutical company, medical device or communications organization.
I have no conflicts of interest to disclose ( i.e. no industry funding received or other commercial relationships).
I have no financial relationship or advisory role with pharmaceutical or device-making companies, or CME provider.
I will not discuss or describe in my presentation at the meeting the investigational or unlabeled ("off-label") use of a medical device, product, or pharmaceutical that is classified by Health Canada as investigational for the intended use.
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LEARNING OBJECTIVES
• Analyse different sequences for MRI
• Understand the role of weighing and how it’s correlated
• Recognize the impact of MRI on treatment plans
• Evaluate the pertinence of MRI in brachytherapy
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STATISTICS
• It is estimated that in 2014 in Canada:
• 23 600 Canadian men will be diagnosed with prostate cancer
• 4000 men will die from this disease
• In our department, we treat about 2300 patients per year
• 282 patients are treated for a prostate cancer ~ 13%
• 144 patients received brachy + external treatments ~ 50%
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ANATOMY
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MRI ADVANTAGES FOR PROSTATE
• Excellent visibility of the prostate gland and capsule
• Superior intraprostatic localisation of dominant lesion
• Better anatomical delineation of the apex, base
• Neurovascular bundles
• External urinary sphincter
• Bladder neck
• Intraprostatic ejaculatory ducts
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PROCEDURE RADIOLOGY USES WHEN IMAGING THE PROSTATE …
• NO ejaculations 48 hours before the MRI exam
• 1 Fleet the morning of the exam
• Empty bladder
• Use probe to remove the presence of air in rectum if posterior to the prostate
• Administer Buscopan to stop peristalsis.
• Inject Gadolinium with dynamic sequencing
• Rectal coils (some centers)
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A LOOK AT WHAT WE DOCharles-LeMoyne Hospital, radiation oncology department, opened in 2011
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PLANNING
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• Supine
• Head rest
• Hands on chest holding a ring
• Knee sponge
• Impossible to use vac lock: coil not integrated into the table
• Rectum is empty, bladder is full…
• MRI needs to be similar to the planning CT-scan for better fusion
POSITIONING
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• T2 weighed imaging
• axial
• sagital
• T1 weighed imaging
• axial
Multiparametric approach
• Diffusion (DWI)
• axial
• Apparent diffusion coefficient (ADC)
• axial
• Dynamic contrast enhanced (DCE)
• axial
MRI PROTOCOL FOR SEQUENCING PROSTATE
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• Prostate and seminal vesicle easily visible
• OARs (bladder, rectum, penile bulb)
• Will help position the other sequences
SAGITTAL T2W IMAGING
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• Localize the tumor (hypointense zone)
• Locate the prostate and it’s different zones
• Sequences used by the radiation oncologist for contouring
AXIAL T2W IMAGING
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OTHER T2 WEIGHTED
Tzikas, Technol Cancer Res Treat, 2011Henstchel, Strahlenther Onkol, 2011”
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AXIAL T1W IMAGING
• See if there is hemorrhaging (hyperintense zones)
• Avoid misdiagnosis of cause of hemorrhaging
• Delay of 6 to 8 weeks between biopsy and MRI
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• Allows us to determine the microscopic movements of water within the tissue
• Sequences are very sensitive to artifacts, especially metal
• Combining the T2 image: increase accuracy of detection
• Allows us to make a cartography ADC (next page)
DIFFUSION WEIGHTED IMAGING (DWI)
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• Done from the diffusion (DWI)
• Tumors on ADC are weaker than the normal tissues.
• Hypointense region on ADC shows tumor
• Compare and analyze with the other sequences (T2, DCE)
APPARENT DIFFUSION COEFFICIENT (ADC)
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DYNAMIC CONTRAST ENHANCE (DCE)
• Allows to measure the vascularity of tissues
• Tumors are characterized by how fast they absorb the contrast
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DCE : MRI GRAPHIC UNITS
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CHANGES IN PLANIFICATION
URETHROGRAM VISIPAQUE INJECTION
GADOLINIUM INJECTION
BEFORE MRI (CT ONLY)
All patients All patients N/A
SINCE ARRIVAL OF MRI
Patients with MRI containdication
Prostate bed with lymph nodes
• Prostate in place• Postate bed with
positive digital rectal exam
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TREATMENTS ARE MORE PRECISEHip replacement
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OTHER EXEMPLE OF HIP REMPLACEMENT
CT-Scan MRI Fusion CT-MRI
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BETTER PROSTATE LOCALISATION
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Discovered after MRI; extra-capsular invasion
• Change of treatment plan
• Hormone therapy for 3 months
• Radiation therapy
TUMOR ADAPTED TREATMENT
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Extra-capsular invasion
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POST-HORMONAL THERAPY
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Discovering a nodule
• Adjust dosimetry
• Boost 125%
• Compromise elsewhere
TUMOR ORIENTED TREATMENT
Arrayeh, Red Journal, 2012Pollack, Red Journal, 2002
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DOSIMETRY AND DVH
Ippolito, Am J Clin Oncol, 2012
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FORTUNATE DISCOVERIESWhile analyzing the images from the MRI, we found…
CHONDROSARCOMA
T1W T2W
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Bladder Cancer
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MORE DISCOVERIESAnother bladder cancer!
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BRACHYTHERAPY
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Use MRI to guide insertion of catheters
• Procedure is done on MRI table
• Image taken
• Insertion of few catheters
• Image to verify position
• Insertion of few more catheters
• Image again
• Etc.
Do MRI post insertion of catheters
• Use ultrasound to guide catheters insertion
• MRI after
• Improve dose optimization
MRI IN BRACHY : 2 CHOICES
What we do
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MRI COMPATIBLE APPLICATORS
1 model only$$$$$
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Dentist paste!
• Applies easily
• Dries rapidly
• Holds the catheters in place sufficiently
• Can still make adjustments if needed
NEED IMAGINATION… LOTS OF IMAGINATION!
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T2 weighed imaging only
• Optimal image of the prostate
• Zoom in on tumoral zone
• Image quality of catheters is sufficient to fuse with ct-scan
• Saves time (pt under anesthesia)
SEQUENCE
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Why we do CT-MRI fusionDosimetry cannot use MRI alone :
• Difficulty of seeing catheters
• Therefore reconstruction of the catheters is hard
• Uncertainty when determining catheter tip
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Nodules• Boost to 125% respecting OAR
Treatment adjustment
Gaudet, Red Journal, 2010
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• Better localization of the prostate
• Better contrast for soft tissue than CT Scan
• Clearer image of prostate anatomy • More precise planning
• Better target control
• Improved treatments for seminal vesicles
CONCLUSION
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THANK YOU !
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BIBLIOGRAPHY• Société canadienne du cancer[https://www.cancer.ca/fr-ca/cancer-information/cancer-type/prostate/diagnosis/?
region=qc], (Page consultée le 4 mai 2015)
• Favre, Martins. “Place de l’IRM dans le bilan du cancer de la prostate”, dans ID NEWS, 2 juillet 2012, [http://www.idblog.ch/genitourinaire/place-de-lirm-dans-le-bilan-du-cancer-de-la-prostate/], (page consultée le 21 avril 2015)
• Liney, Gary P and Marius A. Moerland. 2014. “Magnetic Resonance Imaging Acquisition Techniques for Radiotherapy Planning”. Seminars in Radiation oncology. Volume 24, p. 160-168.
• Dirix, Piet, Karin, Haustermans and Vincent, Vandecaveye. 2014. “The Value of Magnetic Resonance Imaging for Radiotherapy Planning”. Seminars in Radiation oncology. Volume 24, p. 151-159.
• Tanderup, Kari, Akila N., Viswanathan, Christian, Kirisits and Steven J., Frank. 2014. “Magnetic Resonance Image Guided Brachytherapy”. Seminars in Radiation Oncology . Volume 24, p. 181-191.
• Ménard, Cynthia and Uulke A, van der Heide. 2014. “Introduction: Magnetic Resonance Imaging Comes of Age in Radiation Oncology”. Seminars in Radiation oncoly, Volume 24, number 3, p. 149-150.
Thanks for the help :
• Talar Derashodian, MD
• Maryse Mondat, physicist
• Christina Marcoux, therapist
• Eric Murray, application specialist Siemens