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1. An imaging apparatus comprising: a patient table configured to support a lying patient, the patient table comprising a gurney and a base, the gurney being configured to slide along a longitudinal direction between two extreme positions in relation to the base; an electrically supplied moto-reducer-controlled by a control unit, configured to slide the patient table along at least one spatial axis; and a lock/unlock system of a sliding of the patient table, wherein the lock/unlock system of the sliding is a mechanical system independent from the electrical supply, manually controlled by a handle adapted to be actuated by a human operator, wherein the imaging apparatus is adapted for positioning the lying patient in a radiographic apparatus and is provided in combination with the radiographic apparatus, wherein the radiographic apparatus is a cone-beam computerized tomography (CBCT) scanner, a spiral computerized tomography scanner, a Magnetic Resonance Imaging (MRI) scanner, or a Position Emission Tomography (PET) scanner, wherein the lock/unlock system comprises a first and a second opposing element, the first and the second opposing elements being respectively mounted on a first and a second shaft independently rotatable with respect to each other, at least one of the first and the second opposing elements being axially movable in a direction of insertion and disconnection of the first and the second opposing elements in an axial direction of the first and the second opposing elements, wherein the lock/unlock system is provided with a first fixed bracket and a second mobile bracket, wherein, at a first end opposed to a second end grabbed by the human operator, the handle is provided with a spring pin which engages alternatively: in an insertion hole obtained in the first fixed bracket, blocking the lock/unlock system in a position wherein a motion of the moto-reducer is transmitted; and in a dis-insertion hole obtained in the first fixed bracket blocking the lock/unlock system in a position wherein the motion of the moto-reducer is idle, wherein the lock/unlock system comprises a proximity sensor recognizing an axial position of the handle, and wherein, when the spring pin is inserted in the insertion hole, the sensor is active and communicates to the control unit of the radiographic apparatus causing the gurney to be moved automatically, and wherein, when the handle is extracted from the insertion hole, the sensor is inactive, signaling to the control unit that the moto-reducer is idle.
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