Notes in G8 Introduction to Medical Imaging

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Status	Last Update	Fields
Published	11/02/2024	X-rays are produced when electrons are accelerated under a potential difference and turned into {{c1::electromagnetic radiation}}
Published	11/02/2024	On an X-ray image, the less dense subjects such as air appear {{c1::dark (black)}} while more dense subjects appear {{c1::lighter (white)}}
Published	11/02/2024	{{c1::CT Scans}} use a combination of x-rays to build cross sectional images (“slices”) of the body
Published	11/02/2024	{{c1::Barium}} or {{c1::iodine}} dye give IV or PO to enhance the image
Published	11/02/2024	Contrast makes the structure appear {{c1::brighter (whiter)}}
Published	11/02/2024	When NOT to order contrast a. {{c1::Head injuries (brain bleed)}} b. {{c1::Fractures/bones}} c. {{c1::Kidney stones}}
Published	11/02/2024	CT Angiography (CTA) looks at {{c1::blood vessels}} to identify blood clots, dissections, and blockages
Published	11/02/2024	CT vs MRICost: {{c1::CT - cheaper and quicker than MRI}}Images: {{c1::CT - more radiation and less detailed images than MRI}}
Published	11/02/2024	Frequency of US:Low frequency ultrasound allows {{c1::deep penetration}} but {{c1::worse resolution of image}}High frequency ultrasound allows {{c1::b…
Published	11/02/2024	{{c1::image-occlusion:rect:left=.0149:top=.7872:width=.2965:height=.2:oi=1}}{{c2::image-occlusion:rect:left=.3518:top=.7905:width=.3028:height=.2095:o…
Published	11/02/2024	{{c1::Anechoic}}: complete or near absence of returning sound waves (echoes); appears black
Published	11/02/2024	{{c1::Hypoechoic}}: few echoes return; appears gray and darker than surrounding tissue
Published	11/02/2024	{{c1::Hyperechoic}}: large amplitude of returning echoes; appears white and brighter than surrounding tissue
Published	11/02/2024	Different Modes for US{{c1::M-Mode}}: Motion- useful to see heart beat, valve movement, lung sliding{{c1::Doppler Mode}}: characterizes the direction …
Published	11/02/2024	Orientation of US Image
Published	11/02/2024	MRI weighted imagesT1 – enhances signal of {{c1::fatty tissue}} and suppresses signal of {{c1::water}}T2 – enhances signal of {{c1::water}} and suppre…
Published	11/02/2024	pros of MRI
Published	11/02/2024	cons of MRI
Status	Last Update	Fields