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  • one year ago

Randy has been experiencing several disturbing symptoms over the last year, including muscle weakness, slow reaction time, visual perception issues, seizures, hearing loss, weight gain, general sense of pain and delusions. A. Explain why his doctors might be concerned with the following in making their diagnosis: • Neurotransmitters • Hormones • Myelin sheath • Occipital lobe • Temporal lobe B. Describe how each of the following brain scanning techniques would aid the doctors in making their diagnosis of these symptoms: • Pet scan • fMRI • EEG

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  1. senia01
    • one year ago
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    A - occipital lobe is concerned with vision so its not that neurotransimitter do not have anything to do with wt gain myelin sheath deal with nerve impulse conduction.... its the temporal lobe, that deals with organising sensory information... people have temporal lobe epilepsy. B - A positive emission tomography (PET) scan is used to produce a detailed, three-dimensional picture of the inside of the body. The images clearly show the part of the body that is being investigated and can also highlight how effectively certain functions of the body are working. What are PET scans used for? PET scans are most commonly used to help diagnose a range of different cancers and work out the best ways of treating them. The information provided by a PET scan can show how far a cancer has spread or how well it is responding to treatment. PET scans are occasionally used to help plan complex heart surgery, such as a heart transplant. They are also used to help diagnose a number of conditions that affect the normal workings of the brain (neurological conditions), such as dementia. http://www.nhs.uk/conditions/PET-scan/Pa... The main advantages to fMRI as a technique to image brain activity related to a specific task or sensory process include 1) the signal does not require injections of radioactive isotopes, 2) the total scan time required can be very short, i.e., on the order of 1.5 to 2.0 min per run (depending on the paradigm), and 3) the in-plane resolution of the functional image is generally about 1.5 x 1.5 mm although resolutions less than 1 mm are possible. To put these advantages in perspective, functional images obtained by the earlier method of positron emission tomography, PET, require injections of radioactive isotopes, multiple acquisitions, and, therefore, extended imaging times. Further, the expected resolution of PET images is much larger than the usual fMRI pixel size. Additionally, PET usually requires that multiple individual brain images are combined in order to obtain a reliable signal. Consequently, information on a single patient is compromised and limited to a finite number of imaging sessions. Although these limitations may serve many neuroscience applications, they are not optimally suitable to assist in a neurosurgical or treatment plan for a specific individual. http://www.fmri.org/fmri.htm An electroencephalogram (EEG) is a painless test that records brain activity. How it works When the brain cells send messages to each other, they produce tiny electrical signals. In an EEG test, electrodes (flat metal discs) are placed onto your scalp using a sticky substance. These electrodes pick up the electrical signals from your brain and send them to an EEG machine, which will record the signals as wavy lines onto paper or on a computer. The EEG rarely causes any side effects and takes 30 to 45 minutes (see How an EEG is performed for more information). Why it is used The pattern of electrical activity is useful for diagnosing a number of conditions that affect the brain, particularly epilepsy. EEGs are also used to investigate other conditions that may affect brain function, such as dementia, infection of the brain, head injuries, brain tumours or bleeding on the brain (haemorrhage). The EEG may help to show your doctor the section of your brain that is not working as it should. It will also help them to decide which treatment will be most suitable for you. http://www.nhs.uk/conditions/EEG/Pages/I...

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