An innovative phantom with the shape of breasts for detailed QA in Breast MRI. It allows quantitative evaluation of breast MRI with breast coils. It has an adjustable height of the phantoms in the range of 10cm to fit the depth of the coils. The horizontal position of the phantoms can be set aribitrarily on the 30cm long slit. The test parameters are spatial resolution and quantitative evaluation of ADC on test pieces of tissue substitute.