Table of Contents
Which projection can be found on the skull?
Skull PA Occipito-Frontal This projection demonstrates the frontal bone, crista galli, internal auditory canals, anterior ethmoid and frontal sinuses, greater and lesser wings of the sphenoid, and petrous ridges. Position of patient Prone with the vertical beam angled at 20 degrees.
Which cranial bone is best visualized on an AP axial projection of the skull Towne method?
skull/facial bones/sinuses/mandible/
| Question | Answer |
|---|---|
| Which cranial bone is best demonstrated with an AP Axial (Towne) projection of the skull? | occipital |
| When using a 30′ caudad angle for the AP Axial (Towne) projection, which positioning line should be perpendicular to the IR? | OML |
Which cranial projection best demonstrates the cranial base?
Chapter12 Bontegar
| Question | Answer |
|---|---|
| Which cranial projection will best demonstrate a possible basilar fracture | Horizontal Beam Lateral |
| Which positioning line should be perpendicular to the plane of the IR for the AP Axial(Towne) projection with a 37 degree caudad CR angle | IOML |
When taking a PA axial projection Caldwell method of the skull the central ray is directed?
When taking a PA axial projection (Caldwell method) of the skull, the central ray is directed: Angled 15 degrees caudad to center of IR through Nasion.
Which projection of the skull is considered a full basal projection?
study for review class
| Question | Answer |
|---|---|
| Which of the following will best be demonstrated with a submentovertex (full basal) projection of the skull? | Base of cranium |
| What are the names of the “L” shaped bones that are located posterior to the nasal cavity? | Palatine |
Which sinuses are best demonstrated with the PA projection?
Paranasal Sinuses Anatomy & Postioning Ch 13
| Question | Answer |
|---|---|
| What sinuses are best demonstrated with the PA Caldwell projection? | the frontal Sinuses. They are not superimposed over air filled cavities. |
What is a Potter Bucky?
In medical imaging, an anti-scatter grid (also known as a Bucky-Potter grid) is a device for limiting the amount of scattered radiation reaching the detector, thereby improving the quantity of diagnostic medical x-ray images.
What is grid cut off?
Grid cutoff is an undesirable absorption of primary x-ray beams by grid strips, which prevents the useful x-rays from reaching the image receptor. It is caused by improper grid positioning and most often occurs with parallel grids.
When taking a PA axial projection Caldwell method of the skull the central ray is?
Which sinuses are visualized best with a PA Caldwell projection?
A properly positioned PA Axial projection, Caldwell Method, of the skull will demonstrate? Frontal sinuses and the anterior ethmoidal sinuses.
Which sinus groups are best demonstrated with the PA axial projection Caldwell method?
Positioning / Merrills Chapter 20
| Question | Answer |
|---|---|
| Which sinus group is of primary importance in the lateral projection of the sinuses? | Sphenoidal |
| Which sinus groups are best demonstrated with the PA axial projection, Caldwell method? | Frontal and anterior ethmoidal |
What skull projection is most commonly used to demonstrate the occipital bone?
study for review class
| Question | Answer |
|---|---|
| What is the name of the part of the temporal bone that houses the organs of hearing and equilibrium? | Petrous |
| Which position/projection would be used to best demonstrate the occipital bone? | AP axial (Towne) projection |
Which projection demonstrates all four sets of the sinuses?
Paranasal Sinuses Anatomy & Postioning Ch 13
| Question | Answer |
|---|---|
| Which single projection of the paranasal sinuses routine provides an image of all 4 sinus groups? | The lateral. |
| Which projection of the paranasal sinuses is the only one that shows the Sphenoid Sinuses without any superimposition? | The lateral projection |
What is the difference between view and projection in radiography?
The term projection is used to describe a positioning technique; it does not refer to the radiographic image. View: Pertains to the radiographic image only. The terminology used to describe the positioning technique will simply be applied to the image, but the word view will replace the term position or projection.
What is the difference between AP and PA on an xray?
Which one is AP and which one is PA? The answer is… below. On the PA view, the cardiac borders are smaller and more defined. Given the way the x-ray beam works, the heart appears smaller and with sharper borders on the PA view.
What is the difference between AP projection and PA projection?
In the PA projection, the thickness of abdomen was 10% (p < 10-3) lower, DAP 27% lower (p = 0.009) and the effective dose 53% (p < 10-3) lower than in AP projection. There was no statistically significant difference in image quality between the AP and the PA projection.
What is the PA view on a chest X-ray?
On the PA view, the cardiac borders are smaller and more defined. Given the way the x-ray beam works, the heart appears smaller and with sharper borders on the PA view. The reason is that the patient’s chest (anterior) is against the x-ray film with the beam entering from posterior (P) to anterior (A) – hence the term “PA.”
What is the best structure for a PA axial skull?
Structures best seen PA Axial Skull (Caldwell): Frontal bone frontal sinus Crista Galli CR and angle for AP Axial (Towne): 2 inches above glabella 30 degrees caudal Angle used if patient cannot tuck for AP (Towne): tuck to IOML and add 7 degrees= 37 degrees caudal