Some of the tests for knee radiographs alone include X-ray tests, CT tests, 3D CT tests as well as MRI tests. The cost is definitely different for different means of examination. X-rays alone can be had for around$110, plain CT scans are generally around$300, and 3D reconstructive CT exams are generally around$700-$1000. An MRI is 500 dollars for a knee exam, and if the resolution is high, it could be up to 1,000 dollars as well. The different prices mainly depend on the good and bad of the machine, some machines have a particularly high resolution, like 64-row CT is definitely higher than the cost of 32-row CT. 3.0T MRI is definitely higher than the cost of 1.5T MRI examination, the difference is just in this.