What is a Canthomeatal line?

What is a Canthomeatal line?

The canthomeatal line is also referred to as the orbitomeatal line and is defined as running from the lowermost point of the eye’s bony orbit to the preauricular point.

Where is the orbitomeatal line?

The orbitomeatal line was defined as running from the outer canthus of the eye to the midpoint of the external auditory meatus 1,2.

What is Orbitomeatal plane?

The term orbitomeatal plane denotes a horizontal plane for brain stereotaxis based on cranial landmarks. It passes through the inferior margin of the orbits and the openings of the external auditory canals.

How to position for CT head?

Approach Considerations. Anesthesia is typically unnecessary with most CT scans. The patient typically lies on his or her back with head in the midline position on a movable table that slides into and out of the doughnut hole. An x-ray tube typically rotates around the patient’s head.

What is radiographic baseline?

An anatomic line which maintains a fixed relation to the facial bones throughout the period of growth was found in the acantho-meatal line, hereafter referred to as the “pediatric base line” (P.B.L.).

What is MML in radiology?

mentomeatal line (MML) external acoustic meatus (EAM)

What is OML in radiology?

Orbitomeatal line is a positioning line used in radiography of the skull. It passes through the outer canthus of the eye and the center of the external auditory meatus. It is used for positioning the patient for different radiographic views including Water’s view, Perorbital view, Lateral view, and others.

What does Frankfort horizontal mean?

(frănk′fort) A cephalometric plane joining the anthropometric landmarks of porion and orbitale; the reproducible position of the head when the upper margin of the ear openings and lower margin of the orbit of the eye are horizontal.

Why is contrast used in CT head?

The purpose of contrast in the setting of head imaging is to evaluate the physiological and pathological processes that alter the permeability of the blood-brain barrier that causes abnormal contrast enhancement.

What is the centering point for skull?

Centering is usually on the sella turcica (approximately 2 cm above the midpoint of the OM line) with the central beam perpen- dicular to the median sagittal plane.

What skull positioning line that is generally known as radiographic baseline?


Question Answer
What line is also known as the radiographic baseline? OML – orbitomeatal line
OML is the abbreviation of _______ _____. orbitomeatal line
What is demonstrated in the PA skull. Frontal bone, petrous ridges filling the orbits, crista galli, ethmoid sinus, dorsum sellae

What is the Frankfort line?

Frankfort horizontal line, the line passing through the orbitale and porion, is one of the most widely used intracranial landmarks in cephalometric analysis.

Why is Frankfort plane important?

The Frankfort Craniometric Agreement of August 1882 is considered a landmark development in anthropometrics. It developed a horizontal plane of reference, referred to as the Frankfort horizontal (FH) plane. The FH plane or the auriculo-orbital plane closely represents the natural head position.

What is a triple phase CT?

The triple-phase liver CT protocol is a useful examination in the assessment of focal liver lesions, hypervascular liver metastases and endocrine tumors. It involves a dedicated late arterial phase, portal venous phase and delayed phase acquisition.

What color is CSF on CT?

Supernatant Color Normal CSF is crystal clear. However, as few as 200 white blood cells (WBCs) per mm3 or 400 red blood cells (RBCs) per mm3 will cause CSF to appear turbid.