Training Collections
Musculoskeletal Imaging
Emergency Imaging
PET Imaging
Pediatric Imaging
Training Collections
Musculoskeletal Imaging
Emergency Imaging
PET Imaging
Pediatric Imaging
Lesson
Orbital Imaging Protocols
4 topics, 10 min.
Lesson
Orbit Anatomy
10 topics, 19 min.
Lesson
Case Review - Ocular Pathology
17 topics, 1 hr. 11 min.
Anterior Globe Rupture with Laterally Dislocated Cataract
4 m.Foreign Body in Globe
4 m.Wood Foreign Body and Ocular Hypotony
2 m.Hemmorhage in Both Chambers, Open Globe
3 m.Staphyloma
4 m.Persistent Hyperplastic Primary Vitreous (PHPV)
5 m.Retinal Detachment
3 m.Retinoblastoma on CT
4 m.Retinoblastoma on MRI
9 m.Bilateral Retinoblastoma
7 m.Ocular Pathology - Review
11 m.Endophthalmitis
3 m.PHPV Review, Coloboma, and Staphyloma
5 m.Phthisis Bulbi, Macrophthalmia, and Microphthalmia
4 m.Ocular Calcification
4 m.Retinoblastoma - Review
5 m.Choroidal Melanoma
3 m.Lesson
Case Review - Intraconal Pathology
15 topics, 1 hr. 8 min.
Intraconal, Conal and Extraconal Anatomy
1 m.Intraconal Hemangioma
5 m.Venous Vascular Malformation
3 m.Optic Nerve Glioma, NF1
4 m.Optic pathway glioma (pilocytic astrocytoma)
4 m.Optic Neuritis, Multiple Sclerosis
6 m.Optic Neuritis, Multiple Sclerosis (2)
7 m.Neuromyelitis Optica Spectrum Disorder
5 m.Neuromyelitis Optica With Spinal Cord Involvement
3 m.Optic Nerve Sheath Meningioma
5 m.Bilateral Optic Neuritis, Leukemia
6 m.Intraconal Pathology - Review
11 m.Optic Neuritis - Review
5 m.Optic Nerve Glioma - Review
4 m.Optic Nerve Sheath Meningioma - Review
6 m.Lesson
Case Review - Conal Lesions
5 topics, 16 min.
Lesson
Case Review - Extraconal Injuries and Abnormalities
18 topics, 55 min.
Extraconal Pathology - Introduction
1 m.Periorbital Cellulitis & Abscess
4 m.Type 3 Orbital Infection
3 m.Solitary Fibrous Tumor
4 m.Langerhans Cell Histiocytosis
2 m.Juvenile Ossifying Fibroma
2 m.Perineural Spread of Squamous Cell Carcinoma
5 m.Proptosis from Extraosseous Extension of Prostate Metastasis
3 m.Orbital Floor Fracture
5 m.Orbital Floor Fracture with Muscle/Fat Herniation
4 m.Orbital Floor Fracture: Status Post Repair
2 m.Bilateral Orbital Fracture Repair
2 m.Periorbital Cellulitis - Review
5 m.Orbital Pseudotumor - Review
3 m.Orbital Wall Abnormalities - Review
3 m.Orbital Fracture - Review
7 m.Giant Cell Reparative Granuloma
3 m.Granulomatous Sinusitis with IgG4-related Ophthalmic Disease
4 m.Lesson
Case Review - Orbital Appendage Pathology
6 topics, 19 min.
0:00
A quick word about artifacts,
0:02
both for CT and MRI.
0:04
On CT, the artifact that causes the most difficulty is dental
0:09
amalgam artifact or dental appliances that can lead to a
0:13
lot of spray artifact interfering with
0:15
the quality of your imaging.
0:17
With MRI, the metal artifact of dental amalgam
0:20
is less of an issue.
0:22
However, you have to be careful to make sure that
0:24
the patient is not wearing eye makeup,
0:26
because much of the eye makeup has in it cobalt and
0:30
that will lead to artifacts obscuring the eyelids.
0:33
Similarly, if patients have tattoos around their eyes,
0:37
you may have issues with artifacts which can be reduced,
0:40
once again, by reducing the TE,
0:42
the time to echo of the MR sequence.
Imaging Artifacts in MRI and CT
HIDEInteractive Transcript
0:00
A quick word about artifacts,
0:02
both for CT and MRI.
0:04
On CT, the artifact that causes the most difficulty is dental
0:09
amalgam artifact or dental appliances that can lead to a
0:13
lot of spray artifact interfering with
0:15
the quality of your imaging.
0:17
With MRI, the metal artifact of dental amalgam
0:20
is less of an issue.
0:22
However, you have to be careful to make sure that
0:24
the patient is not wearing eye makeup,
0:26
because much of the eye makeup has in it cobalt and
0:30
that will lead to artifacts obscuring the eyelids.
0:33
Similarly, if patients have tattoos around their eyes,
0:37
you may have issues with artifacts which can be reduced,
0:40
once again, by reducing the TE,
0:42
the time to echo of the MR sequence.
Report
Description
Faculty
David M Yousem, MD, MBA
Professor of Radiology, Vice Chairman and Associate Dean
Johns Hopkins University
Tags
Physics and Basic Science
Orbit
Neuroradiology
Neuro
MRI
Head and Neck
CT
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