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Grade Sheet – 600.145 HW #2

Name 1: __________________ Email/Phone: ______________ Role/contribution: ___________ __________________________. Grade Sheet – 600.145 HW #2. Name 2: __________________ Email/Phone: ______________ Role/contribution: ___________ __________________________.

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Grade Sheet – 600.145 HW #2

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  1. Name 1: __________________Email/Phone: ______________ Role/contribution: ___________ __________________________ Grade Sheet – 600.145 HW #2 Name 2: __________________Email/Phone: ______________ Role/contribution: ___________ __________________________ I/we have adhered to the rules on this homework assignment: ___________________________ ___________________________ (signature) (date) (signature) (date)

  2. Homework groundrules • Work in groups of at most 2 people • Do not work with other groups on homework • Do not refer to previous years’ homework • Include the cover sheet on the homework • Both students should sign the honor pledge • You should state what each of you did

  3. Image-guided prostate biopsy • Consider the problem of prostate biopsy under image guidance. • Currently, we are exploring several possible guidance scenarios for this problem: • trans-rectal ultrasound guidance • in-scanner CT guidance • in-scanner MRI guidance • Of these modalities: • Ultrasound enables you to see the outline of the prostate and urethra. It does not show cancer directly. Seeds and needles are visible, though rather fuzzily. Bone is visible, but borders are poor. • CT shows bone really well and the outline of the prostate very poorly. It does not show cancer directly. Seeds and needles show up well. • MRI shows prostate and cancer well, but shows bone poorly. Needles and seeds can show up as loss-of-signal areas. Ferromagnetic materials or large metal pieces or coils can cause great imaging problems.

  4. Problem: Plan in MRI, Execute in CT preoperative • For the CT guided system, we will assume that a preoperative MR scan is available showing the suspected cancer lesions. • The intraoperative system resembles the in-scanner system shown in class intraoperative

  5. Notation & Formula Example pelvis prostate MRI scanner biopsy target MRI images Suppose that we plan to pick out biopsy targets on MRI images Computed Measured

  6. Notation & Formula Example pelvis prostate MRI scanner biopsy target MRI images Computed Measured

  7. Notation & Formula Example pelvis prostate MRI scanner biopsy target MRI images Computed Measured

  8. Notation & Formula Example pelvis prostate MRI scanner biopsy target MRI images Computed Measured

  9. Notation & Formula Example pelvis prostate MRI scanner biopsy target MRI images Computed Measured

  10. Notation & Formula Example pelvis prostate MRI scanner biopsy target MRI images Computed Measured

  11. Notation & Formula Example pelvis prostate MRI scanner biopsy target MRI images Computed Measured

  12. Notation & Formula Example (modified) pelvis prostate MRI scanner biopsy target MRI images Suppose that we plan to use standard biopsy positions defined with respect to the prostate, instead of picking the targets out with respect to the MRI Image Computed Measured

  13. Notation & Formula Example (modified) pelvis prostate MRI scanner biopsy target MRI images Computed Measured

  14. Problem 1 • Assume that the surgeon wants to use a standard biopsy pattern defined with respect to the prostate, but wants to know the target coordinates with respect to the pelvis. • Draw a diagram similar to the examples (including use of a green multi-segment arrow) showing how this calculation can be performed • Give the corresponding formula for FPelvis,Targ

  15. Problem : CT guided biopsy • For the CT guided system, we will assume that a preoperative MR scan is available showing the suspected cancer lesions. • The intraoperative system resembles the in-scanner system shown in class

  16. Problem 2: CT-guided Biopsy preoperative • Some of the pertinent coordinate systems are shown below. There may be others. patient other anatomy prostate cancer MRI scanner MRI images biopsy targets patient other anatomy CT images cancer CT scanner biopsy targets prostate robot needleholder robot base needle tip intraoperative

  17. Problem 2 (con’d) Question 2.1: Describe a procedure for targeted biopsy of prostate cancer lesions based on the use of preoperative MRI images and intraoperative CT. Your answer should include a discussion of what steps need to be done preoperatively and what steps need to be done intraoperatively. It should include a discussion of the information developed in each step and of how that information will be used in subsequent steps. It should also include a brief discussion of how this information relates to concepts such as “segmentation” and “registration” discussed in class. Hint: A good way to do this is to develop a flow chart and then include a discussion of each step. It also sometimes helps to make a sketch showing the patient, equipment, etc. at key steps. Finally, consider this answer in concert with the answer to question 2.2

  18. Problem 1 (continued) Question 2.2: Using a graphical method similar to that developed in class, show the key relationships between the various coordinate systems needed to perform this procedure. Assign a symbolic name to each relationship (e.g., Frobot,needle-holder). • Explain how these relationships will be determined and identify the steps in the procedure that will be used to determine them. • At each step in the procedure, use a graphical means to illustrate what is known and what is not yet known. A preferred way to do this is to use colors or heavy vs thin lines. Please follow the convention from class that dashed lines mean things that change over time and solid lines mean things that are assumed not to change. • Using the method shown in class, give an expression for Frobot,needle-holder that will place the needle tip on a desired biopsy target. E.g., Frobot,needle-holder=Fa,b•Fc,b-1•…

  19. Problem 3: Ultrasound Guidance Question 3: Suppose now that the CT system has been replaced with a trans-rectal ultrasound system, and that the robot has been modified to work with this system. • Explain how you would modify your procedure from question 2.1 to enable you to use it in this context. Again, words like “segmentation” and “registration” are likely to be part of the answer. • Show a modified relationship graph for key steps • Hint: pay attention to what shows up well in both MRI and Ultrasound.

  20. Problem 5: Comparison Question 5: Compare the systems described in your answers to questions 1 and 2, using criteria similar to those you used in Homework #1.

  21. Problem 4: No Preop MRI Question 4: Suppose that there is no preoperative MRI. I.e., we have decided that this patient is a candidate for biopsy based on elevated PSA levels. How would this affect your biopsy procedure and system?

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