X-ray radiation online health with ct scan and MRI about all information and PDF

What is MRI ?PDF download

X-ray 

Similar to the case with most other intracranial pathology, MRI is the examination of decision for the determination and portrayal of meningiomas. At the point when appearance and area are run of the mill, the determination can be made with a high level of sureness. In certain cases, in any case, the appearances are atypical and cautious understanding is expected to make a right preoperative determination.

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Meningiomas ordinarily show up as extra-hub masses with a wide dural base. They are typically homogeneous and all around surrounded, albeit numerous variations are experienced. It appears that the sign power of meningiomas on T2-weighted pictures corresponds with the histological subtypes 29.

Signal attributes ( in MRI )

Signal attributes of regular meningiomas include:

T1 (in MRI )

normally isointense to dark issue (60-90%) 3,8,13

hypointense to dark issue (10-40%): especially stringy, psammomatous variations

T1 C+ (Gd): generally extraordinary and homogeneous upgrade

T2 (in MRI )

generally isointense to dim issue (~50%) 3,8,13

hyperintense to dim issue (35-40%)

generally corresponds with a delicate surface and hypervascular tumors 13

seen in microcystic, secretory, cartilaginous (metaplastic) choroid and angiomatous variations 12

hypointense to dark issue (10-15%): contrasted with dim issue and typically connects with harder surface and progressively sinewy and calcified substance

DWI/ADC: (in MRI )

atypical and dangerous subtypes may show more prominent than anticipated confined dispersion albeit late work proposes this isn't helpful in tentatively foreseeing histological evaluation 15,16 

MR spectroscopy: (in MRI )

for the most part it doesn't assume a noteworthy job in finding yet can help recognize meningiomas from impersonates. Highlights include: 

increment in alanine (1.3-1.5 ppm)

expanded glutamine/glutamate

expanded choline (Cho): cell tumor

missing or fundamentally decreased N-acetylaspartate (NAA): non-neuronal beginning

missing or fundamentally decreased creatine (Cr)

MR perfusion: (in MRI )

great relationship between's volume move consistent (k-trans) and histological evaluation 28

CT scan : (radiation) 

CT is frequently the principal methodology utilized to explore neurological signs or side effects, and regularly is the methodology which distinguishes a coincidental injury:

non-differentiate CT (radiation) :-

60% marginally hyperdense to typical cerebrum, the rest are more isodense

20-30% have some calcification 8

post-differentiate CT (radiation) :-

72% splendidly and homogeneously differentiate improve 8

dangerous or cystic variations exhibit greater heterogeneity/less extreme improvement

hyperostosis (5%) 23

run of the mill for meningiomas that adjoin the base of the skull

need to recognize receptive hyperostosis from:

direct skull vault intrusion by adjoining meningioma

essential intraosseous meningioma

growth of the paranasal sinuses (pneumosinus dilatans) has likewise been proposed to be related with front cranial fossa meningiomas 20

lytic/dangerous areas are seen especially in higher evaluation tumors however should make one speculate elective pathology (for example hemangiopericytoma or metastasis) ref

Meningiomas

Meningiomas are extra-hub tumors and speak to the most widely recognized tumor of the meninges. They are a non-glial neoplasm that begins from the meningocytes or arachnoid top cells of the meninges and are found anyplace that meninges are found, and in certain spots where just rest cells are dared to be found. Despite the fact that they are generally effectively determined and are ordinarily favorable to have a low pace of repeat following medical procedure, there are countless histological variations with variable imaging highlights and, in certain occurrences, increasingly forceful natural conduct.

An expansive division of meningiomas is into essential intradural (which might possibly have an optional extradural augmentation) and essential extradural (uncommon) 18. They can likewise be arranged by the area (for example spinal, intraosseous, intraventricular, and so on.), by histological variations (for example clear cell, rhabdoid, and so on.), and by etiology (for example radiation-initiated, and so on.).

Normal meningiomas show up as dural-based masses isointense to dim issue on both T1 and T2 weighted imaging improving clearly on both MRI and CT. A portion of the variations as referenced before can, be that as it may, differ drastically in their imaging appearance.

This article is a general conversation of meningioma concentrating on run of the mill essential intradural meningiomas and the imaging discoveries of intracranial malady. For spinal and essential extradural tumors allude to spinal meningioma and essential extradural meningioma articles separately. A considerable lot of the histological variations are likewise talked about independently.

Infrequently (for example 1-2% of cases 27) meningiomas may likewise emerge at ectopic locales (ectopic essential meningioma, for example, in head and neck, circle, nose, paranasal sinus, oropharynx and even places, for example, the lung

What is ultrasound in ultrasonography? It's risks ,side effects, strengths and weaknesses?

Definition of ultrasonography :-

• Ultrasonography (usg) is application of medical with ultrasound based imagine diagnostic technique used to visualize internal oragans, structure and their pathological sessions.
• Ultrasonography is widely utilized in medicine primarily in gastroentrology, cardiology, gynecology and obstetrics, urology and diagnosis or therapeutic procedure with the guidance of ultrasonography (for instance biopsies or drainage fluid collection).
  

Ultrasound in ultrasonography :-

• In physics the term "ultrasound" applies the all acoustic energy. (Longitudinal mechanical wave)with a frequency above the audiable range of human hearing.
• The audiable range of sound is 20hertz - 20 kilohertz .
• Ultrasound frequency is greater than 20 kilohertz.
  

Strengths and weaknesses :-

• The images muscles and soft tissue very well and particularly useful for delineating the interfaces between solid and fluid filled spaces.
• It renders "live "images where are the operator can dynamically select the most useful section for the diagnosing and documenting changes often enbiling repid diagnosis.
•  It show the structure as well as some aspects of the function or organs.
• It has known long-term side effects and competitively flexible ; examination can be performed bedside.

Weakness of ultrasound imaging :-

• Ultrasound can not penetrate bone And performs poorly when there is air between the scanner and oragan of interest.
• For ex :- overlying gas in the gastrointestinal tract often makes ultrasound scanning of the pancreas difficult.
• Even in the absence of bone or air , the depth penetration of ultrasound is limited, making it difficult to image structures that are far removed from the body surface, especially in obsess patient.
• The method is operator dependent.
• A high level of skill and experience is need to acquire good quality images and make accurate diagnoses.

Risks and side effects :-

• Ultrasound is generally considered a "safe"imagine modality .
• However slight detrimental effects have been accasionally observed.
• Diagnostic ultrasound studies of the fetus are generally considered to be safe during pregnancy.
• This diagnostic procedure should be performed only when there is valid medication indication and the lowest possible ultrasonic exposure settings should be used to gain the necessary diagnostic information under the "as low as reasonably achievable" or alarm principle.
• World health organization technical report series 875 (1998)  support that ultrasound is harmless.
• "Diagnostic ultrasound is recognized as a safe effective and highly flexible imagine modality capable of providing clinically relevant information about most part of the body in a rapid and cast effective fashion"
• Although there is no evidence ultrasound could be harmful for the fetus , as food and drug administration views promotion, selling or leasing of ultrasound equipment for making "keepsake fetal videos" to be an unproved us of a medical device .
• Studies in the safety of ultrasound a study at the Yale school of medicine found a correlation between prolonged and frequent use of ultrasound and abnormal neuronal migration in mice.
• A meta analysis of several ultrasonography studies no drastically significant harmful effects  from ultrasonography.
• Studies found no statically significant harmful effect ultrasonography but mentioned that there was a lack of data on long term substantive outcomes such as neurodevelopment.

How many part of the x-ray machine?

1. X-ray tube

1. Operating console

1. High voltage transformer

1. Tube head & protective housing

1. Bucky

1. Colimeter

1. Gride

1. Patient table

1. Radiographic film

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1. Cathode 

1. Anode 

1. Glass envelop

1. The cathode  :-

• Cathode has a negative electrical charge
• Contain two major components

1. Filament
2. Focusing cup

1. Filament :-

• This is a negative because it is a source of electron
  
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• Note that the diaphragm show a magnified view of face and it's show dual filament.
• Only one filament at time will work.
• The small filament designed to be used with relatively small part while the larger filament is used when the larger body part being X-RAYs.
• The structure which support the filament is. Known as the "focusing cup".
• It is designed and shaped so that when the X-RAY machine powered up, electron will literally "boil"of the filament.
• It glows White hot and the elecrtons however the filament Ina space" charge" until the moment of the exposure and they accelerate very rapidly towards the anode which is not very far away .

This process is known as a "thermionic emmision".

                     Biography of  

             Layout of 500mA X-RAY machine

• 1. x-rays examination table
•  2. Spot film device

     3. column stand

                 PROPERTY  OF X-RAY
  
Definition :-
   
       X-ray are defined as weightless package of pure energy that are without electrical charge and that are travel in waves along a straight line with a specific frequency and speed 

   The properties of x-rays maybe classified as :-

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1. Physical
2. Biological
3. Chemical
4. Physiochemical

           

1. Physical properties of x-ray :-

• X-ray belong to a family of electromagnetic radiation . Having a wevlegth between 10A and 0.01A
• They travel with the same speed as that of visible light (1,86,000 miles/sec)
• They are invisible to the eye and can not be seen , heard or smelt
• They remain undetected by the human senses
• They cannot be reflected, refracted or deflected by a magnetic or electric field as they do not posses any charge
• X-rays are pure energy ,no mass and they transfer energy from place to place in the form of quanta (photons)
• X-ray are produced by the collision of electron with tungsten atom. 
• The Collisions which occur are of two types,thus giving rise to two type of spectra:

1. Continuous spectra ( general radiation, Bremsstrahlung radiation,or braking radiation)
2. Characteristic spectrum or line spectrum   

• X-rays can penetrate various objects and the degree of penetration depend upon the quality of x-rays beam and also on the intensity and wavelength of the x-ray beam.

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• Effect of interaction of x-rays with matter

1. Coherent scattering.  
   
2. Photoelectric scattering. 
   
3. Compton scattering.