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Which of the following skull types is considered average in size and shape? a. mesocephalic b. brachycephalic c. dolichocephalic 2 Which skull type is narrow from side to side? a. mesocephalic b. dolichocephalic c. brachycephalic 3 In a typically shaped head, the petrous pyramids project anteriorly and medially at what angle? a. 37 degrees b. 40 degrees c. 47 degrees d. 54 degrees 4 Which plane of the head is placed parallel to the plane of the IR for a lateral projection of the skull? a. sagittal b. transverse c. midsagittal d. midcoronal 5 The central ray and center of the IR position for a lateral projection of the skull is: a. 1 inch below the EAM b. 2 inches below the EAM c. 1 inch above the EAM d. 2 inches above the EAM d. 2 inches above the EAM 6 Which of the following is true regarding the lateral projection of the skull? 1.) the midsagittal plane of the head is parallel to the plane of the IR 2.) the interpupillary line is perpendicular to the IR 3.) the mentomeatal line is parallel with the bottom edge of the IR a. 1 and 2 b. 1 and 3 c. 2 and 3 d. 1, 2, and 3 7 Which of the following should be seen superimposed on a lateral projection of the skull? 1.) orbital roofs 2.) external acoustic meati 3.) temporomandibular joints a. 1 and 2 b. 1 and 3 c. 2 and 3 d. 1, 2, and 3 8 Which method of examining the skull will demonstrate the petrous ridges in the orbits, the ethmoid and frontal sinuses, and the crista galli? a. Towne b. Caldwell c. Schüller d. Rhese 9 The central-ray angle for the PA axial (Caldwell) projection of the skull is: a. 5 degrees cephalad b. 10 degrees cephalad c. 12 degrees caudad d. 15 degrees caudad 10 Which of the following is perpendicular to the plane of the IR for a Caldwell projection of the skull? a. glabellomeatal line b. acanthiomeatal line c. orbitomeatal line d. mentomeatal line 11 Often a patient cannot be turned into the prone position for a PA axial projection of the skull (Caldwell method). What central-ray angle could be used if the AP axial projection is used instead? a. 10 degrees caudad b. 15 degrees cephalad c. 10 to 15 degrees caudad d. 10 to 15 degrees cephalad 12 Which of the following lines is placed perpendicular to the plane of the IR for the AP axial (Towne) projection? a. orbitomeatal line b. infraorbitomeatal line c. glabellomeatal line d. acanthiomeatal line 13 If the patient cannot flex the neck to place the orbitomeatal line perpendicular to the IR for an AP axial (Towne) projection, which line should be placed perpendicular? a. acanthiomeatal line b. infraorbitomeatal line c. glabellomeatal line d. mentomeatal line b. infraorbitomeatal line 14 Which of the following is true regarding the placement of the IR for an AP axial (Towne) projection of the skull? 1.) its upper margin is at the level of the top of the cranium 2.) its upper margin is 2 inches above the top of the cranium 3.) its upper margin is 2 inches below the top of the cranium a. 1 only b. 2 only c. 3 only d. 1, 2, and 3 15 Which method of examining the skull is identified in the figure below? a. Haas b. Towne c. Rhese d. Caldwell 16 If the infraorbitomeatal line is placed perpendicular to the IR during an AP axial (Towne) projection of the skull, how much is the central ray angled? a. 15 degrees caudad b. 30 degrees caudad c. 37 degrees caudad d. 45 degrees caudad 17
Which of the following is clearly demonstrated within the foramen magnum during an AP axial (Towne) projection of the skull? 1.) dorsum sellae 2.) sella turcica 3.) posterior clinoid processes a. 1 and 2 b. 1 and 3 c. 2 and 3 d. 1, 2, and 3 18 What is the central-ray angulation for demonstration of the entire foramen magnum during an AP axial (Towne) projection? a. 37 degrees caudad b. 40 degrees caudad c. 60 degrees caudad d. 40 to 60 degrees caudad d. 40 to 60 degrees caudad 19 Which of the following methods will clearly demonstrate the petrous ridges, foramen magnum, dorsum sellae, and posterior clinical processes? 1.) Haas (PA axial) 2.) Towne (AP axial) 3.) Schüller (SMV) a. 1 and 2 b. 1 and 3 c. 2 and 3 d. 1, 2, and 3 20 What is the average central-ray angulation for the PA axial (Haas) projection of the skull? a. 25 degrees caudad b. 25 degrees cephalad c. 30 degrees caudad d. 30 degrees cephalad 21 Which line should be placed parallel to the plane of the IR for the SMV projection of the cranial base? a. acanthiomeatal line b. orbitomeatal line c. infraorbitomeatal line d. mentomeatal line c. infraorbitomeatal line 22 Radiographic demonstration of the cranial base is performed by which method? a. Haas b. Rhese c. Towne d. Schüller 23 What is the central-ray angulation for the SMV projection? a. 0 degrees b. 5 degrees caudad c. 5 degrees cephalad d. 5 to 7 degrees cephalad 24 The x-ray projection demonstrated in the figure below is the: a. SMV b. VSM c. AP axial d. PA axial 25 For an SMV projection of the cranial base, the central ray should always be perpendicular to the: a. mentomeatal line b. orbitomeatal line c. infraorbitomeatal line d. acanthiomeatal line c. infraorbitomeatal line 26 Which of the following are clearly demonstrated on an SMV projection of the cranial base? 1.) mastoid process 2.) sphenoid process 3.) carotid canals a. 1 and 2 b. 1 and 3 c. 2 and 3 d. 1, 2, and 3 27 Which of the following methods will demonstrate the optic canal? a. Rhese b. Towne c. Schüller d. Caldwell 28 Which line is placed perpendicular to the IR for the parietoorbital oblique (Rhese) projection of the optic canal? a. mentomeatal line b. acanthiomeatal line c. orbitomeatal line d. infraorbitomeatal line 29 How many degrees is the head rotated for the parietoorbital (Rhese) projection of the optic canal? a. 30 degrees b. 45 degrees c. 53 degrees d. 60 degrees 30 The central-ray angulation for the parietoorbital (Rhese) projection of the optic canal is: a. 0 degrees b. 5 degrees c. 10 degrees d. 15 degrees 31 Which of the following would be demonstrated in the projection shown in the figure below? a. petrous ridge b. sphenoid sinus c. optic canal d. zygomatic arch 32 Which parts of the patient's face touch the table for a PA axial projection (Caldwell method)? 1.) forehead 2.) nose 3.) chin a. 1 and 2 b. 1 and 3 c. 2 and 3 d. 1, 2, and 3 33 Which of the following are demonstrated on an AP axial (Towne method) projection of the skull? 1.) petrous pyramids 2.) occipital bone 3.) posterior portion of the foramen magnum a. 1 and 2 b. 1 and 3 c. 2 and 3 d. 1, 2, and 3 34 For an optimal image of the mastoid process, which of the following must occur? 1.) use of a 0.6-mm focal spot or less 2.) use of a high-resolution screen/IR 3.) use of the smallest possible field size a. 1 and 2 b. 1 and 3 c. 2 and 3 d. 1, 2, and 3 35 For an AP axial Towne Method projection, to what level of the patient should the upper boarder of the IR be aligned? Highest point of the vertex (about 2.5 inches superior to the glabella) 36 What image characteristic indicates that a general survey image of the skull is an AP projection instead of a PA projection? the orbits are considerably magnified 37 When performing either the AP or AP axial projection for general surveys of the skull, where on the skull should the central ray be directed? 38 For the AP axial projection of the skull, how should the central ray be directed? 39 For the AP projection of the skull, how should the central ray be directed? 40 For AP and AP axial projections, how should the OML be positioned with reference to the plane of the IR? 41 For AP and AP axial projections, how should the midsagittal plane be positioned with reference to the plane of the IR? 42 For the PA projection with a perpendicular central ray, list 5 structures shown: - the orbits filled by the margins of the petrous pyramids - the posterior ethmoidal air cells - crista galli - frontal bone - frontal sinuses 43 For PA and PA axial projections of the skull, which parts of the patient's facial area should be in contact with the table or vertical grid device? 44 For PA and PA axial projections of the skull, how should the OML be positioned with reference to the plane of the IR? 45 For PA and PA axial projections of the skull, how should the midsagittal plane be positioned with reference to the plane of the IR? 46 For a lateral projection of the skull, which positioning line of the head should be parallel with the plane of the IR? 47 For a lateral skull projection, how should the interpupillary line be positioned with reference to the plane of the IR? 48 For a lateral skull projection, how should the midsagittal plane be positioned with reference to the plane of the IR? 49 List 5 common positioning errors of the skull: - Rotation - Tilt - Excessive Flexion - Excessive Extension - Incorrect central ray 50 What is the most effective way to protect the patient from unnecessary radiation during an x-ray of the skull? restricting the radiation beam by using proper collimation 51 The majority of repeat examinations is due to this: uncomfortable body position resulting in rotation or other motion 52 In a dolichocephalic skull, the petrous pyramids lie at what angle with the midsagittal plane? 53 Whether the radiographer elects to perform the exam with the patient in the recumbent or upright position depends on these 4 variables: - the equipment available - the age & condition of the patient - radiographer and or radiologist preferencewhether upright images would increase diagnostic value (ex: showing air-fluid levels in paranasal sinuses) 54 In a brachycephalic skull, the petrous pyramids lie at what angle with the midsagittal plane? 55 What is the exit point of the CR for the Caldwell Method? the nasion at an angle of 15 degrees caudad 56 Where is the CR for the Towne Method?
57 What is the exit point of the CR for the Haas Method? 1.5" superior to the nasion 58 Where is the CR for the SMV method? A point 3/4" anterior to the level of the EAM 59 Where is the CR for a lateral projection of the eye? Perpendicular through the outer canthus 60 Where is the CR for a lateral skull? Perpendicular entering 2" superior to the EAM 61 What is the CR for the lateral dorsal decubitus skull? 62 What is the CR angulation for a lateral skull? 63 What is the CR angulation for a lateral dorsal decubitus skull? 64 What is the CR angulation for the Caldwell Method (Pa axial)? 65 What is the CR angulation for an AP/AP axial projection of the skull? 66 What is the CR angulation for the Towne Method? 30 degrees caudad to the OML or 37 degrees to the IOML 67 What is the CR angulation for the Haas Method? 68 What is the CR angulation for the SMV? 69 What is seen on a lateral skull? - Superimposed orbital roofs and greater wings of sphenoid 70 What is seen on a lateral dorsal decubitus? - Superimposed orbital roofs and greater wings of sphenoid 71 What is seen on a Caldwell method (PA axial)? - Entire cranial perimeter showing three distinct tables of squamous bone 72 What is seen on an AP axial projection of the skull? - Entire cranial perimeter showing three distinct tables of squamous bone 73 What is seen on a Towne method(AP axial)? - Equal distance from lateral border of skull to lateral margin of foramen magnum on both sides, indicating no rotation 74 What is seen on a Haas method (PA axial)? - Projection of dorsum sellae and posterior clinoid processes within foramen magnum 75 What is seen on an SMV(Schuller Method)? - Clearly visible structures of the cranial base, indicated by adequate penetration Which cranial bone is best demonstrated on the AP axial Towne method?skull/facial bones/sinuses/mandible/. Which plane of the head is placed parallel to the plane of the IR for a lateral projection of the skull?Cards
Which positioning line is perpendicular to the IR for a PA projection of the skull?The mentomeatal line (MML) will be approximately perpendicular to the plane of the IR.
Which cranial positioning line should be aligned perpendicular to the image receptor IR for a Posteroanterior PA skull radiograph?-The orbitomeatal line (OML) of the patient must be perpendicular to the image receptor.
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Which of the following is true regarding the placement of the IR for a Towne projection of the skull?
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