Disposable patient positioner system for positioning a patient in a prone position on a patient support structure, which disposable patient positioner system comprises: - a disposable chest positioner assembly, which disposable chest positioner assembly comprises a disposable inflatable chest cushion, which chest cushion comprises a rear wall, wherein the rear wall of the chest cushion comprises a chest body contact sheet which is made of a soft material, which chest body contact sheet has a rear surface which forms part of the outer surface of the chest cushion, which chest body contact sheet is on the rear surface provided with at least one adhesive zone, which adhesive zone is adapted to be attached to the skin of a patient in the chest area, wherein the disposable inflatable chest cushion has a deflated state and an inflated state, wherein in the inflated state, the rear wall of the chest cushion has a neck side edge and an abdominal side edge, wherein said neck side edge and abdominal side edge have a concave shape having a radius of curvature, wherein the radius of curvature of the neck side edge of the rear wall is larger than the radius of curvature of the abdominal side edge of the rear wall, and wherein the distance between the neck side edge and the abdominal side edge of the rear wall at the center of the chest cushion is substantially equal to the length of a human breast bone, and - a disposable pelvis positioner assembly, which disposable pelvis positioner assembly comprises a disposable inflatable pelvis cushion, which pelvis cushion comprises a rear wall, wherein the rear wall of the pelvis cushion comprises a pelvic body contact sheet which is made of a soft material, which pelvic body contact sheet has a rear surface which forms part of the outer surface of the pelvis cushion, which pelvic body contact sheet is on the rear surface provided with at least one adhesive zone, which adhesive zone is adapted to be attached to the skin of a patient in the pelvis area, wherein the disposable inflatable pelvis cushion has a deflated state and an inflated state, wherein in the inflated state, the rear wall of the pelvis cushion has an abdominal side edge and a genital side edge, wherein said abdominal side edge and genital side edge have a concave shape having a radius of curvature, wherein the radius of curvature of the abdominal side edge of the rear wall is larger than the radius of curvature of the genital side edge of the rear wall, and wherein the distance between the abdominal side edge and the genital side edge of the rear wall at the center of the pelvis cushion is substantially equal to the distance between the lower edge of the abdomen and the upper edge of the exterior genitals in a human, wherein the inflatable chest cushion and the inflatable pelvis cushion are adapted to in their inflated state together support the torso of the patient on the patient support structure and wherein the shape of the inflatable chest cushion and the inflatable pelvis cushion in their inflated state allows to leave the abdominal region of the patient decompressed. - a disposable chest positioner assembly, which disposable chest positioner assembly comprises a disposable inflatable chest cushion, which chest cushion comprises a rear wall, wherein the rear wall of the chest cushion comprises a chest body contact sheet which is made of a soft material, which chest body contact sheet has a rear surface which forms part of the outer surface of the chest cushion, which chest body contact sheet is on the rear surface provided with at least one adhesive zone, which adhesive zone is adapted to be attached to the skin of a patient in the chest area, wherein the disposable inflatable chest cushion has a deflated state and an inflated state, wherein in the inflated state, the rear wall of the chest cushion has a neck side edge and an abdominal side edge, wherein said neck side edge and abdominal side edge have a concave shape having a radius of curvature, wherein the radius of curvature of the neck side edge of the rear wall is larger than the radius of curvature of the abdominal side edge of the rear wall, and wherein the distance between the neck side edge and the abdominal side edge of the rear wall at the center of the chest cushion is substantially equal to the length of a human breast bone, and - a disposable pelvis positioner assembly, which disposable pelvis positioner assembly comprises a disposable inflatable pelvis cushion, which pelvis cushion comprises a rear wall, wherein the rear wall of the pelvis cushion comprises a pelvic body contact sheet which is made of a soft material, which pelvic body contact sheet has a rear surface which forms part of the outer surface of the pelvis cushion, which pelvic body contact sheet is on the rear surface provided with at least one adhesive zone, which adhesive zone is adapted to be attached to the skin of a patient in the pelvis area, wherein the disposable inflatable pelvis cushion has a deflated state and an inflated state, wherein in the inflated state, the rear wall of the pelvis cushion has an abdominal side edge and a genital side edge, wherein said abdominal side edge and genital side edge have a concave shape having a radius of curvature, wherein the radius of curvature of the abdominal side edge of the rear wall is larger than the radius of curvature of the genital side edge of the rear wall, and wherein the distance between the abdominal side edge and the genital side edge of the rear wall at the center of the pelvis cushion is substantially equal to the distance between the lower edge of the abdomen and the upper edge of the exterior genitals in a human,