Download Free Medical Role Of Mri In Ent Diseases PowerPoint Presentation

Role Of Mri In Ent Diseases PowerPoint Presentation

DOWNLOAD MEDICAL POWERPOINT PRESENTATION

About This Presentation

Description : Download Free Role Of Mri In Ent Diseases Professional PowerPoint Presentation for your presentation

Tags : role of mri in ent diseases

Published on : Jul 06, 2017 | Views : 2694 | Downloads : 25

Shareable Url :

Embed Code :

Comment

Transcript

Slide 1-

ROLE OF MRI IN ENT DISEASES BY PROF. Dr. YASSER ABDEL AZEEM M.D. PROF. OF RADIODIAGNOSIS AIN SHAMS UNIVERSITY
Slide 2-

MR PHYSICS IN BRIEF Non invasive imaging using hydrogen protons abundant in human body tissues Placing the patient in a magnet and exposing him to various magnetic fields. This yields variations in the magnetic effect induced on protons .
Slide 3-

Computer softwares ------> image formation based on differences in magnetic relaxation properties basically the T1 & T2 differences -----> this is highlighted by the used parameters ( mainly TR & TE ) that yield T1W or T2W images or other. Sequence: the way we repeat our MR experiment to yield T1W, T2W, Proton density, Flair etc.
Slide 4-

Spin echo sequence (Basic sequence ) Good contrast Relatively long time Now less than 5 minutes Gradient echo sequence ( Fast sequence) Average contrast Fast scanning Used for MR angiography
Slide 5-

Inversion recovery sequence STIR--------------> Fat suppressed FLAIR------------> Water suppressed Echo planar techniques for functional imaging Diffusion Perfusion Brain activation MR cisternography Heavily T2W sequences emphasizing CSF
Slide 6-

Magnetization transfer technique Best for post contrast T1W images MR Spectroscopy Placing voxel or voxels over lesions to analyze the metabolic contents of lesions for characterization. MR angiography techniques Time of flight Phase contrast Contrast enhanced
Slide 7-

Bright signal on T1 spin echo - Blood - Fat including Bone marrow - Protenacious material - Melanin - Paramagnetic substances e.g. gadolinium Dark signal on T1 spin echo - Fluid - Most lesions - Metallic objects - Calcification & Air - Cortical bone
Slide 8-

Bright signals on T2 spin echo - Subacute blood - most lesions - Fluids - Melanin Dark signals on T2 spin echo - Fat - Calcification - Chronic blood (hemosiderin) - Air
Slide 9-

MAIN PATHOLOGIES WHERE MRI CAN HAVE A SIGNIFICANT ROLE Skull base lesions difficult or impossible to view on endoscopies or by direct examination. for origin, extent, perineural spread, vascular affection, intracranial extension. Marrow invasion is best detected in non contrast T1W & fat suppressed sequences, occasionally , CT may detect early cortical erosion not detected by MR yet CT consistently underestimate the extent of neoplastic skull base involvement e.g. nasopharyngeal carcinoma & MR is the recommended study of choice
Slide 10-

2- Neck compartments lesions specially the deep ones , better characterize lesions than CT scanning
Slide 11-

ppt slide no 11 content not found
Slide 12-

ppt slide no 12 content not found
Slide 13-

ppt slide no 13 content not found
Slide 14-

ppt slide no 14 content not found
Slide 15-

ppt slide no 15 content not found
Slide 16-

ppt slide no 16 content not found
Slide 17-

ppt slide no 17 content not found
Slide 18-

ppt slide no 18 content not found
Slide 19-

ppt slide no 19 content not found
Slide 20-

ppt slide no 20 content not found
Slide 21-

ppt slide no 21 content not found
Slide 22-

ppt slide no 22 content not found
Slide 23-

ppt slide no 23 content not found
Slide 24-

ppt slide no 24 content not found
Slide 25-

ppt slide no 25 content not found
Slide 26-

ppt slide no 26 content not found
Slide 27-

ppt slide no 27 content not found
Slide 28-

ppt slide no 28 content not found
Slide 29-

ppt slide no 29 content not found
Slide 30-

ppt slide no 30 content not found
Slide 31-

ppt slide no 31 content not found
Slide 32-

ppt slide no 32 content not found
Slide 33-

ppt slide no 33 content not found
Slide 34-

3. Cerebellopontine angle & internal auditary canal lesions
Slide 35-

ppt slide no 35 content not found
Slide 36-

ppt slide no 36 content not found
Slide 37-

ppt slide no 37 content not found
Slide 38-

ppt slide no 38 content not found
Slide 39-

ppt slide no 39 content not found
Slide 40-

ppt slide no 40 content not found
Slide 41-

ppt slide no 41 content not found
Slide 42-

4 - Better visualization and staging of cancer larynx the issue of laryngeal cartilage invasion which upstages tumors to T4 precluding organ preservation therapy
Slide 43-

ppt slide no 43 content not found
Slide 44-

ppt slide no 44 content not found
Slide 45-

ppt slide no 45 content not found
Slide 46-

ppt slide no 46 content not found
Slide 47-

ppt slide no 47 content not found
Slide 48-

ppt slide no 48 content not found
Slide 49-

ppt slide no 49 content not found
Slide 50-

5- Metastatic nodal detection, non contrast MR images are slightly better than CT yet also depend on size criteria. Recently tissue specific MR contrast agent can differentiate metastatic from benign cervical adenopathies
Slide 51-

ppt slide no 51 content not found
Slide 52-

ppt slide no 52 content not found
Slide 53-

ppt slide no 53 content not found
Slide 54-

6- Potential problems or complaints tinnitus specially the pulsatile type and also to detect for reterocochlear causes of the deafness
Slide 55-

Pulsatile tinnitus (subjective) 1-Benign increase ICP: usually female, obese, with headache, clinically she has papilledema, tinnitus. CT & MR empty sella, slit like ventricles or normal. Cause: increased resistance to CSF absorption interstitial brain edema  systolic CSF pulsations transmitted to dural sinuses  periodic compression of heir walls. 2-Otosclerosis: osseous dysplasia of the inner ear where abnormal foci of vascular haversian bone replaces the normal otic capsule. Abnormal intraosseous anastomosis and inflammation are responsible for the tinnitus. 3-Paget’s disease of the temporal bone: as in otosclerosis, abnormal intraosseous anastomosis.
Slide 56-

Pulsatile tinnitus (objective) 1-Vascular neoplasms: as glomus jugulare or glomus tympanicum 2-Congenital vascular anomalies: as aberrant or dehiscent internal carotid artery, dehiscent jugular vein, high jugular bulb, redundant arterial loop of AICA 3-Vascular malformations: dural AVM or AVF, pial (parenchymal) AVM. 4-Other vascular abnormalities: intracranial aneurysm, atherosclerotic carotid artery disease, fibromuscular dysplasia of ICA, carotid artery dissection.
Slide 57-

ppt slide no 57 content not found
Slide 58-

ppt slide no 58 content not found
Slide 59-

ppt slide no 59 content not found
Slide 60-

ppt slide no 60 content not found
Slide 61-

7- Congenital anomalies of the inner ear
Slide 62-

9- Better detection and characterization of the brain causes of ENT problems.
Slide 63-

ppt slide no 63 content not found
Slide 64-

ppt slide no 64 content not found
Slide 65-

ppt slide no 65 content not found
Slide 66-

ppt slide no 66 content not found
Slide 67-

9- Non invasive imaging of vascular lesions
Slide 68-

ppt slide no 68 content not found
Slide 69-

10- MR Spectroscopy has the potential to monitor surgical & radiotherapy or chemotherapy treatment & to identify early recurrent tumors of head & neck & differentiate them from post treatment changes by identifying the metabolic constituents of the lesion rather than depending on volume changes. Main indicator is the elevation of choline\creatinine ratio
Slide 70-

ppt slide no 70 content not found
Slide 71-

11- MR cisternography for CSF rhinorrhea & otorrhea
Slide 72-

ppt slide no 72 content not found
Slide 73-

ppt slide no 73 content not found
Slide 74-

CONCLUSION Full history & detailed clinical data are essential for the radiologist to tailor this MR study & to add other modalities if needed
Slide 75-

THANK YOU