A method for producing a porous body comprising apatitecollagen composite fibers comprising the steps of gelling a dispersion comprising long apatitecollagen composite fibers having an average length of 10-75 mm, short apatitecollagen composite fibers having an average length of 0. Each of the plurality of capacitors has a capacitance weighted with a prescribed weighting factor. A hinge may extend along the length of the cover. A shape model is used in conjunction with Multi-Label Random Walker to constrain the seeding process within MLRW. The apparatus also includes a first delay line delaying the first intermediate signal by a first delay amount; a second delay line delaying the first intermediate signal by a second delay amount; a third delay line delaying the second intermediate signal by a third delay amount; and a fourth delay line delaying the second intermediate signal by a fourth delay amount.