A flowmeter that includes a moulded housing delimiting a measuring chamber; a rotatable measuring body having a rotatable shaft extending across the measuring chamber; and point bearings for mounting and positioning opposite extremities of the rotatable shaft in the housing. In some embodiments, the method involves autologous tumor cell vaccination prior to autologous hematopoietic and immune cell transplantation. Thus, the resulting image is re-oriented with respect to the first coordinate system.