The Physics of Ultrasounds Essay - 1717 Words

The Physics of Ultrasounds Without the use of physics in the medical field today, diagnosis of problems would be challenging, to say the least. The world of medical imaging in particular has benefited greatly from the use of physics. Ultrasound is sound waves that have a frequency too high for humans to hear. With a shorter wavelength than audible sound, these waves can be directed into a narrow beam that is used in imaging soft tissues (Farr and Allisy-Roberts 183). As with audible sound waves, ultrasound waves must have a medium in which to travel and are subject to interference. In addition, much like light rays, they can be reflected, refracted, and focused (Farr and Allisy-Roberts 186). In general, ultrasound waves†¦show more content†¦With direct current, if pressure is applied to the disk, voltage is produced; if the pressure reverses, there is also a reversal of voltage. Alternating current can also be used, in which case the disk alternately expands and contracts. Based on the principle of piezoelectricity, alternating pressure on the disk likewise produces an alternating voltage (Farr and Allisy-Roberts 183-84). Transducers are used in either pulsed or continuous-wave modes, corresponding to the use of direct current or alternating current, respectively (Farr and Allisy-Roberts 183-84). Pulsed modes are basically used for imaging, while continuous wave modes are primarily used for therapy (Bushong and Archer 78). In a continuous-wave mode, the disk on the transducer expands and contracts back and forth, creating a continuous wave with the same frequency (f) as the vibrating transducer. Because the velocity ( ) of sound changes as it encounters objects of differing densities, the wavelength ( ) of the ultrasound changes proportionally, as given by the equation = =Æ’Ã ¡f, since the frequency is held the same. Thus, if a transducer is operating at 3.5 MHz, the wavelength of the ultrasound wave through average soft tissue (in which sound has a velocity ofShow MoreRelatedThe Physics of Ultrasound Essay888 Words   |  4 PagesWithout the use of physics in the medical field today, diagnosis o f problems would be challenging, to say the least. The world of medical imaging in particular has benefited greatly from the use of physics. Ultrasound is sound waves that have a frequency above human audible. (Ultrasound Physics and Instrument 111). With a shorter wavelength than audible sound, these waves can be directed into a narrow beam that is used in imaging soft tissues. As with audible sound waves, ultrasound waves must haveRead MorePrinciples of Physics in Ultrasound Essay1717 Words   |  7 PagesPrinciples of Physics in Ultrasound Physics has become an important part of medicine allowing specialist doctors and radiographers to rapidly access a patient’s condition and to help in long-term diagnosis. This enables doctor’s to treat patients before their condition deteriorates. This procedure would not be possible without the use of X-rays, CAT scans, MRI scans, ultrasound and endoscopes, which allow doctors to see inside the body with little or no surgeryRead More81253894 Ultrasound Physics Essay1171 Words   |  5 Pagesï » ¿ ULTRASOUND PHYSICS Name Institution a) Calculate the Acoustic impedance of subcutaneous tissue, muscle and bone. Assume subcutaneous tissue has a density of 1060kg/m3 (Hedrick 2003), muscle has a density of 1104kg/m3 (Madjor 2008) and bone has a density of 5065kg/m3 (Hedrick 2003). Give your answer in Mrayls. Please use speed of sound as 1540m/s for tissue, muscle and bone In ultrasound, Acoustic impedance (Z) is the quantity of measurement of resistance to sound when passing throughRead MoreHigh Intensity Focused Ultrasound Medical Physics1873 Words   |  8 PagesHigh Intensity Focused Ultrasound Medical Physics DJARI, Bryan â€Æ' Introduction Medical science has been established since the earliest time of the 1800’s. Using physics, scientist from all over the world are able to physically upgrade and improve both the effectivity and efficiency. In the fields of medicine, sounds, is an important factor to study. From many ranges of sound, ultrasound are sound or other vibrations having an ultrasonic frequency. With the use of ultrasound, doctors are able toRead MorePhysics Assignment : Medical Imaging1672 Words   |  7 PagesKathleen Anne Maguire 1/12/2016 Physics Assignment Medical Imaging MDPMS 1. Sound is travelling from material 1 to material 2. The density of material 1 id 25 kg ms-3 and the density of material 2 is 18 kg m-3. The speed of sound in material 1 is 1900 ms-1 and in material 2 is 18 kg m-3. The speed of sound in material 1 is 1900 ms-1 and in material 2 it is 700 ms-1. The acoustic impedance of each material Z= pV Acoustic impedance (Z) Density is (p) Acoustic Velocity (V) ForRead MoreUltrasound Technician, No Two Days1197 Words   |  5 PagesHowever for an ultrasound technician, no two days are exactly the same. Each shift brings with it a new docket of patients with different ailments. The ultrasound technician job description may call for a tech to be on their feet for a majority of the day; working in darkened rooms while performing their scan. Every appointment is different from the last and these sessions can last anywhere from 20 minutes to an hour. When finished, the reports are then sent to a radiologist for review and diagnosisRead MoreComparison of X-Ray and Ultrasound1217 Words   |  5 PagesX rays and Ultrasound are two of the main imaging techniques used in radiography. For the purposes of this essay, we will look at conventional x-rays and diagnostic ultrasound. Conventional x rays are non-invasive diagnostic techniques that are used to capture images of the bodys organs and bones. Diagnostic ultrasounds are high frequency sound wav es to create an image of soft issues in the body such as muscles, joints, and internal organs. As examined below, while both are used in diagnostic radiographyRead MoreEvaluation Of A Diagnostic Medical Sonographer1290 Words   |  6 Pagesmachinery to generate images and perform exams. They use ultrasound technology to obtain pictures of tissues and body organs. The career of sonography offers a wide range of specialties from obstetric and gynecologic to neurosonography. Some of the duties of a sonographer include prepare the patients for the procedure and examine the data recorded to give a detailed summary to the physician. Like any other healthcare professional, ultrasound technicians have responsibilities that are listed in theRead MoreWhat is a radiologist? The medical field is full of many different career paths. Some choose1000 Words   |  4 PagesRadiologists are medical specialists who use radioactive instruments and x-rays to diagnose and make treatment decisions regarding health problems. They examine various types of images including x-rays, computer tomography (CT scans), mammograms ultrasounds, and magnetic resonance imaging scans (MRI). Radiologists are skilled in operating machinery, monitoring imaging sessions, recommending courses of treatment, administering nuclear medications, examining patients, recording medical treatments, andRead MoreThe Process Of Becoming An Ultrasound Technician987 Words   |  4 PagesThe process of becoming an ultrasound technician can be one that is intimidating. However, it doesn’t have to be. With the help of an organization called American Registry for Diagnostic Medical Sonography (ARDMS), those seeking to be a sonographer can achieve their goals. Although there are many steps to take, it can be done. This paper will help instruct individuals who wish to go through the sonography principles and instrumentation (SPI) examination (Sonography Principles Instrumentation [SPI]

A Horror Movie free essay sample

Many things come to mind when people allow themselves to think about horror movies. Most may experience the feeling of butterflies in their stomach for fear or just pure excitement, but where does that fear or excitement come from? One might say that it is the anti-social instincts of horror that we all have hidden and festering deep down inside. A great horror author Stephen King once said,† that watching a horror movie helps us control the anti-social instincts we all have inside†. Some people might say that we are all a little crazy and anti-social in our own way and that some of us just hide it better. Many will argue that the impression and memories of that first horror film will always influence the way the one deals with horror but does not always make one’s anti-social inner monster want to surface. In most horror movies, some of us may agree and some of us may disagree that in some way that a horror movie has left a permanent indent in a single individual’s life. We will write a custom essay sample on A Horror Movie or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page For instance, let us look at the 1984 version of Wes Craven’s â€Å"A Nightmare on Elm Street†; this is the very first nightmare that occurred on a now well-known street. Although this movie is one of the greatest horror movies ever produced, a classic that will always haunt children and adults for many years to come. This movie keeps the person watching twitching with fear and on the edge of their seat. Most people that have watched this movie would say that this film is one that will make a person, sleep with the lights on, keep the closet door closed, and the windows locked. Although this movie is a great example of a film that will make you want to keep the lights on when you go to bed, it is also a great example of a film that will make the watcher always remember the plot of the story. â€Å"A Nightmare on Elm Street†, known by many as a great classical horror movie that describes its star actor Robert Englund, also known as Freddy Krueger as a child murder with the spirit of â€Å"the bastard son of 1000 maniacs†. In this film, Freddy Krueger is like any other parent that lives in the quite little neighborhood on Elm Street until the other parents figure out that Krueger is the one who has been abducting local children and killing them with different forms of torture. The other parents take matters into their own hands and burn Krueger alive, in a vow to the dark side Krueger gives up his soul and becomes a figment of our dreams that has a demon living inside of him. He claims his revenge on the descendents of those who murdered him in their sleep while they are dreaming, when they are most vulnerable. What makes this movie so scary and unforgettable for most people is not because of the bloody scenes or the fact that there is demon, with knives for fingers, and a scared face that kills teens in their sleep; it is because Wes Craven made this movie to seem as real as possible. The parts about this movie that make it seem so real is that Krueger would kill his victims by making their worst fears come to life in their dreams. For instance, his victims lie sleeping, their minds slip into what seems to be a seemingly illogical happening (terrifying hallucinations) that we experience in our dreams that make perfect sense at the time. In today’s modern science that is also known as Sleep Paralysis. Sleep Paralysis is a frightening form of paralysis that occurs when a person suddenly finds himself or herself unable to move for a few minutes, most often upon falling asleep. Sleep Paralysis can be referred to as errors of the neural transmission in the brain during REM sleep. So in other words his victims would feel as if what was happing at that time was real but in fact they were sleeping and there was no way to wake them up until it was too late. Although this film does make a good example of a movie that will keep someone on the edge of their seat, sleep with the lights on, and never forget the horrible child murder that we all know as Freddy Krueger. It is also a good example of a movie that after watching can give you the option to say whether your anti-social appetite has been satisfied. This movie’s plot is about a man who had an anti-social craving for murdering children, and because he gave into his appetite, he was transformed into what people would consider a demon. Therefore, that would lead people to believe that the statement that Mr. King sticks by â€Å"that watching a horror movie helps us control the anti-social instincts we all have inside† is in fact very true. It is said that great authors such as Stephen King does a person’s dirty work by creating horror films and books to help stop the craving of the instincts that the human race does so hard to try and hide. On the other hand, horror movies do not always satisfy that craving that all of us have deep down inside.

IELTS Essay Samples of Band 4 Subjects

IELTS Essay Samples of Band 4 SubjectsThere are a number of IELTS essay samples of the six core subjects, you will need to know when taking IELTS and TOEFL exams. This can help you evaluate which essay topics to focus on in your own exam preparations.However, you should also realize that there is no such thing as a single best essay for each subject. You should do some planning before sitting down to write your essay. That means studying the required essay topics and then making an assessment of how much work you have ahead of you. An outline of what you will be covering is essential for this part of your exam preparation.Each essay in this group should include a list of the main points you will need to make in your essay. I recommend working up a few sample essays to review. Then use these samples as you get into it with your teacher.IELTS essay samples of band 4 topics include: The Principles of Business Law, Budgeting, Finance, Good Judgment, Human Resources, Management, Moral and Ethical Issues, Public Relations, Religious Beliefs, Spanish Grammar, Time Management, Teaching, Time Management, and Weight and Measurement.TOEFL essay samples of band 4 topics include: Speaking English Composition, Business Communication, Career Skills, Communication and Teaching Skills, Learning Styles, Reading Comprehension, Speaking, Writing, and Executive Level Management.Course Topics for IELTS Co-Curricular General Education Core Course Core subjects can include: Introduction to Education, Literacy, Higher Education, College Majors, Coursework, High School, Homework, University Preparation, General Education, and Graduation Preparation. These are the main subjects you should be familiar with. IELTS essay samples of band 4 core subjects include: General Education and Courses (Arts, Science, Mathematics, History, Languages, Arts and Social Sciences, and Communication), Proficiency Test of Academic Competence, Multiple Subject Skills Test (MST), Academic Competence and Profici ency Test (ACCT), and English Essay Skills (ESA).A pre-requisite for this course is proficiency in basic skills in English, such as sentence structure, grammar, and vocabulary, but not limited to; reading, writing, spelling, and pronunciation. You will not be required to have knowledge of English grammar in this course.Finally, IELTS essay samples of band 4 are brief descriptions of the techniques used by native speakers of the language. If you choose not to take this course, you will not be able to demonstrate fluency in the language, which is required for all candidates for the exam.

Writing an Essay Topic and Essay Theme

Writing an Essay Topic and Essay ThemeA general essay topics list, by itself, can't be used as a way to write a competitive high school essay. However, by combining two or more general essay topics into one short topic, it is possible to write an essay that will not only be great but also original.By writing a good essay topics list, the essay writer will be able to focus on the topic that is most in demand, and can find that the short topic is usually geared toward what is most important to the reader. This will help to give the essay a real sense of depth. The essay will be so in depth that the student will be able to see the inner workings of the essay topic without getting bogged down with distractions. You may find that you can write the essay without ever getting bogged down with distractions or for a topic that has much history behind it.Sometimes, you will find that an essay topics list that is constructed this way can also be used to write an essay that has been presented at the high school level. If this is the case, the essay writer can find that the topic will be able to provide the raw material that the student needs to develop a broader perspective on the essay topic. This in turn, can help to improve the student's ability to present a deeper perspective, which can aid in the creation of a better essay.The best way to utilize a general essay topics list in a high school setting is to not only combine topics, but to also use an essay theme to help tie them together. It is important that you write the theme as a series of vignettes, each vignette giving the theme a life, and adding to it a solid foundation of the essay topic. The key to making this happen is to write out the essay topic on paper, and write down your ideas of how to tie the topics together to form a single topic.In addition to writing a general essay topics list, you should also write out the essay theme that is used to tie the topics together, and the essay topics list as a guide. B e sure to not only have everything written out, but that you have your outline and your theme planned out in a format where you can follow it from one to the next.After you have everything together in a format that you can use to follow, go through it step by step, and write out the essay. Then, go back and look at your outline and theme and see if you can take the outlines and themes and follow them through the essay, just to make sure that you haven't missed anything.One last note about the use of a general essay topics list and the use of a general essay theme is that, the essay topics list can be used in a number of ways to make your essay from the ground up. This can help you make the essay more professional, and it can help you use it in a way that helps it become a more original piece of writing.

Essay Topics for Ap History Ideas

Essay Topics for Ap History Ideas Essay Topics for Ap History Options Perhaps you still have to understand more about the way to compose a history paper. As a historian you must interrogate your sources and ask the essential questions. PaperCoach can assist you with all your papers, so take a look at this time! The AP World History DBQ presents a prompt and a selection of historical documents that are meant to demonstrate the complexity of a specific historical matter. Then the speaker gets fully aware that the students are not simply listening to his poems, but they're also reacting to them. The best way to success requires a lot of time and energy. If a category of people is not permitted to be educated, it's impossible for them to make important contributions to society in technological, economical, and healthcare arenas. If a category of people is not permitted to participate culturally, we don't understand and appreciate our differences and similarities. For starter s, you'll still will need to employ a whole lot of the knowledge you accrued in your AP US History program or self-studying experience. Studying at home makes it too simple to distract yourself with other critical things which ought to be carried out. Remain realistic and select a topic you're able to research. In its position as an Advanced Placement course, AP US History exists not just to teach you historical facts, yet to help you realize how to approach and analyze historical content in how college-level courses will gradually expect you to be in a position to do. But What About Essay Topics for Ap History? You could also get in touch with your writer to supply some added recommendations or request information regarding the order's progress. Our customer support will gladly tell you whether there are any special offers at the present time, in addition to make sure you are getting the very best service our business can deliver. Use the aid of true academic experts and rec eive the service you have earned! Tell our experts what kind of homework help on the internet you want to get. Essay Topics for Ap History Fundamentals Explained You'll be provided a selection of three essay choices, each focusing on another variety of time periods. It is possible to also reward yourself when you finish reading a course selection. Write a list of ideas you've got or a list of things you're interested in. You can have a look at a list of a number of the simplest elective classes that you are able to finish as quickly as possible here. Utilize your voice and refrain from truly being a monotone bore. Nobody would listen to his pleas for assistance and comprehension. The absolute most important bit of information to keep in mind is to NEVER solely consider the judge. Understanding Essay Topics for Ap History Charter schools don't have unions. Students have to acquire permission should they wish to leave campus or carry out certain pursuits. They lead busy l ives and often forget about an upcoming deadline. Over the span of the calendar year, the student takes 8 unique classes. Or the paper might concentrate on medical discoveries, like the polio vaccine or penicillin. There's not any way of knowing what material your DBQ will involve, therefore it's vital you have a strong general strategy for reviewing the complete scope of what you've learned. Studying the material that will show up on the test is crucial, but with a timed, standardized test, in addition, it is important to be ready for the specific testing atmosphere. Provide a dedicated location for homework and study if at all possible. It is crucial to let your AP reader know, right from the beginning, that you comprehend the prompt. Your class syllabi isn't something you should toss in the garbage on your way from the classroom on the very first moment. Although AP World History tests a wide time period, you aren't predicted to learn every small little detail on the way . Take a peek at our other blog posts about the AP program to find out more about AP course offerings and the way to get ready for your AP exams. How are distinct Artists use lines to draw your focus to the focus. A creative teacher can find with innovative strategies to teach Macbeth that the students will really find enjoyable. Is one particular question that a number of students ask themselves. Deciding upon the correct essay topic can at times be rather hard. If you would like to compose the essay yourself, we believe it would be best to opt for a universal subject or issue. Think of this issue of the history essay you've already written before. If you would like to write a very good history essay you'd better select a topic that's familiar to you. Perhaps you simply do not know the subject well enough, and that's the reason you can't locate the idea for your history essay. Afterwards, the best action to do is to narrow the subject down according to the guidelines supplied by your professor. The ordering procedure to acquire your captivating and authentic world history essay topics is pretty straightforward. In the event you can't find your subject here, don't hesitate to have a talk with our staff and set an order for a customized history essay on your distinct subject.

How to Write an Essay Topics for Territorial Army Exam

How to Write an Essay Topics for Territorial Army ExamYou want to know how to write an essay topics for territorial army exam. This question is probably the first question you will be asked by the soldiers who will take your test. And the reason behind this is that this essay writing task is part of the content of the test, which makes it very important.The first step in writing an essay topics for the territorial army exam is to identify your subject. This is because you have to identify your topic and then describe your topic. This description will be included in the sentence in which you are about to begin the essay. In this example, we will be defining the terms 'territorial army'government.'Identifying the topic is an important step because it can greatly affect your approach in writing the essay. As an example, if you are writing the essay as a single paragraph, then the topic can be simple - for example the titles of books or works of literature. But if you are writing the ess ay as a two-paragraph essay, then you will have to write the description about the geographical features or the locations where you have been involved in the course of your military career.The next step in how to write an essay topics for territorial army exam is to write a description of the geography of the region where you were called up. The use of a descriptive word such as, 'The Bolivian Amazon' can be used in the introduction to the paragraphs. This is because people will know how to read this. They will not need to know the exact geography of the Amazon, but they will be able to recognize that it is in the same region as the first geography section.The next area of information that will be included in the description is the names of the people who are in the region. In this case, the Latin name of the region is 'Mozambique' which is the name of the first element of the name. This is the point when people will read the sentence and know where you have been and what you have b een doing.After reading the introduction and the description of the geography, the way to write an essay topics for territorial army exam is to use some discussion. You can use some creativity to give a detailed explanation of the geographic features. In this case, people will only need to read the two paragraphs of the essay and will know where you have been and what you have been doing.How to write an essay topics for territorial army exam can be easy with the help of the term geography. The geography is a very important area to know. The world is very different from our own. The way to write an essay topics for territorial army exam will be easy with the help of this concept.

The Argument About Research Paper Online Free

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