referring now to the drawings wherein the showings are for purposes of illustrating a preferred embodiment of the invention only and not for purposes of limiting same , fig1 shows the subject new headrest assembly a as positioned on a patient support couch b and supporting a patient c . while the headrest assembly is primarily designed for , and will hereinafter be described in connection with a medical imaging device , such as the ct scanner device d illustrated schematically in fig2 and 3 , it should be recognized that the headrest assembly can be adapted for use in many other patient support environments as well . more specifically , the headrest assembly a comprises a head receiving region 10 which has a base 12 and a pair of side walls 14 , as is best illustrated in fig4 . the side walls are desirable in order to prevent major movements of the patient &# 39 ; s head . for this reason , the region 10 is substantially u - shaped in cross section . as is evident from fig1 the head receiving region 10 is elevated in relation to the rest of the assembly a to comfortably house the head of the patient c . the headrest assembly a also comprises a neck support region 20 which includes a reenforcing structure 22 , as is more clearly illustrated in fig6 . the reenforcing structure 22 is provided between a pair of spaced plies 24 and 26 . these plies can each comprise a suitable thermoplastic resin material in which is embedded a mat of support fibers which can be made of a suitable conventional reenforcing material such as a graphite cloth material . the reenforcing structure 22 located between the plies 24 , 26 , can include a plurality of plies of a biaxial knitted graphite cloth material . it should be recognized , however , that the support structure could also be any suitable type of rigid foam material or even a suitably shaped piece of light wood such as balsa wood . the purpose of the reenforcing structure 22 is to prevent any flexing or vibration or wobbling of the cantilevered head receiving region 10 . such vibration of a patient &# 39 ; s head during the imaging process is considered disadvantageous . as is illustrated in fig5 the reenforcing structure 22 extends partially into the head receiving region 10 . it can be seen that the two plies 24 , 26 become adhered to each other once away from the reenforcing structure 22 , as can be seen in the two side walls of fig5 . therefore , the entire structure illustrated in fig4 is comprised of the pair of plies 24 , 26 which are adhered to each other so that they lose their separate identities in the figure . with reference again to fig1 the numeral 30 designates a torso receiving region of the headrest assembly a . as better illustrated in fig2 the torso receiving region 30 is wider than the head receiving region 10 and comprises a base section 32 , as well as first and second side flanges 34 and 36 extending from opposing side edges of the base 32 . a pair of spaced end flanges 38 , 40 are also provided along an end of the torso receiving region adjacent the neck support region 20 . the side flanges 34 , 36 and end flanges 38 , 40 are adapted to cooperate with the patient receiving couch b in order to secure the headrest assembly a against movement in relation to the couch b . in other words , sideways movement of the torso receiving region 30 , and the entire headrest assembly a , is prevented by the side flanges 34 , 36 which extend over the side walls of the patient receiving couch b as is best illustrated in fig2 and 3 . movement of the headrest assembly a toward the right in fig1 is prevented by the provision of the end flanges 38 , 40 . in order to prevent the movement to the left in fig1 a friction mat 42 is preferably provided between the headrest assembly a and the couch b . preferably , the friction mat is secured to a bottom surface of the headrest torso receiving region 30 . the friction mat can be made of a suitable rubberized polymer material which provides a sticky non - slip surface for the headrest assembly a . although not illustrated in fig2 and 3 , the friction mat 42 can extend over a substantial portion of the bottom surface of the torso receiving region , if desired . the torso receiving region 30 is long enough so that the center of gravity of the patient is supported on the headrest assembly a . in this regard , the center of gravity of the 50th percentile of adult males is illustrated by the symbol 52 . the 97 . 5th percentile of center of gravity of adult human males is illustrated by the symbol 54 . it can be seen that both of these centers of gravity , 52 , 54 , are well above a lower end 56 of the torso receiving region 30 . with reference now to fig3 provided adjacent each of the side edges of the torso receiving region 30 is raised section 57 . because the two raised sections 57 are identical , only the left such raised section will be described in this specification , it being recognized that the right raised section has identical functions and features . with reference now also to fig7 the raised section 57 is provided with a pair of longitudinally spaced indented portions 58 and 59 . the raised sections 57 are provided along a center portion of the torso section 30 although they are not visible in fig1 . adapted to cooperate with the raised sections 57 are a pair of arm rests 60 which are detachably secured to the headrest shell a and the couch b . since the two arm rests are identical , only the left arm rest will be described in detail , it being appreciated that the right arm rest has identical components . the arm rest 60 included a couch contacting portion 62 as well as a top section 63 which is provided with an arm supportion region 64 and a pair of spaced downwardly extending fingers 65 and 66 that are adapted to enter into the pair of indented or depressed portions 58 and 59 ( fig7 ). in this way , the arm rest can be detachably supported in place on the headrest and couch so as to enable a patient to comfortably position his arms during the medical diagnostic process . however , the arm rests can be readily detached when desired . as is evident from fig7 the arms of the patient can be supported in either of two locations depending upon whether or not the arm rests 60 are secured in place . if the entire spinal column of the patient needs to be imaged then the arm supports cannot be utilized since the torso of the patient will need to enter into the medical diagnostic device d . for this purpose , the arms of the patient can be located at the side of the torso receiving region as is illustrated in dotted lines and identified by the letter e . on the other hand , if only the patient &# 39 ; s head and neck need to be imaged , the patient &# 39 ; s arms can be placed more comfortably on the arm supports as is identified by the letter f . since the arm rests 60 will not be exposed to imaging radiation because , as mentioned , the arm rests will be detached if the torso of the patient is to be imaged , the arm rests do not have to be made from a relatively thin material which will absorb imaging radiation in a uniform matter . all that is necessary is that the arm rests be capable of supporting the patient &# 39 ; s arms without much flexing . for this reason , the arm rests can be made of any suitable material such as a conventional plastic material . the headrest assembly a of the present invention is advantageous in that it can cantilever the head of the patient out away from an end 70 of the couch b far enough so that the entire spine of the patient is imagable with a conventional medical diagnostic apparatus d . additionally , the headrest assembly a selectively hooks onto the couch b to prevent movement of the assembly sideways . the friction mat 42 and the end flanges 38 , 40 prevent movement of the headrest assembly lengthwise . however , the entire assembly can be lifted away from the couch b so that the couch can then be used for other medical purposes . because the assembly a is a unitary shell - like article made from a fiber reinforced plastic material , it will absorb imaging radiation in a uniform manner . since the headrest assembly is quite thin , being approximately 0 . 1 cm in thickness , except in the neck region where it is approximately 0 . 25 cm in thickness , it will absorb only a slight amount of radiation . in the preferred embodiment , the assembly a is 16 . 66 cm wide in the torso receiving region . the length of the assembly a is approximately 40 cm . as is evident from the figures , the assembly is arcuate in a cross - section transverse to its longitudinal axis so as to conform to the shape of the couch b . the invention has been described with reference to a preferred embodiment . obviously , alterations and modifications will occur to others upon a reading and understanding of this specification . all such modifications and alterations are intended to be included insofar as they come within the scope of the appended claims or the equivalents thereof .
a headrest assembly for a patient receiving couch includes an integrally formed support body and a structure for detachably securing the support body to an associated patient receiving couch . the support body includes a torso receiving region , a neck supporting region and a head receiving region . the securing structure includes a pair of side securing member for positioning a pair of sides of the support body in relation to the patient receiving couch .