Figure 1From: Early results of urethral dose reduction and small safety margin in intensity-modulated radiation therapy (IMRT) for localized prostate cancer using a real-time tumor-tracking radiotherapy (RTRT) systemMRI image fusion for treatment planning and dose distribution for urethra dose controlled IMRT planning. MRI image fusion is used for treatment planning (left image). IMRT planning is performed with the constraint that urethra dose will not exceed V70Gy > 10% generally (right image).Back to article page