Ultrasonic Testing
... Ultrasonic testing is based on the vibration in materials which is generally referred to as acoustics. All material substances are comprised of atoms, which may be forced into vibrational motion about their equilibrium positions. Many different patterns of vibrational motion exist at the atomic leve ...
... Ultrasonic testing is based on the vibration in materials which is generally referred to as acoustics. All material substances are comprised of atoms, which may be forced into vibrational motion about their equilibrium positions. Many different patterns of vibrational motion exist at the atomic leve ...
Acoustic-Based Biosensors
... Although the crystals and substrates may be different, SH-APM sensors are fabricated in a similar fashion as TSM resonators. One difference that must be noted is the use of IDTs in SH-APM fabrication, which is not present in TSM resonators. Depending on the application, the optimization of sensor pe ...
... Although the crystals and substrates may be different, SH-APM sensors are fabricated in a similar fashion as TSM resonators. One difference that must be noted is the use of IDTs in SH-APM fabrication, which is not present in TSM resonators. Depending on the application, the optimization of sensor pe ...
The figure below shows the horizontal forces acting on a car. (a
... The diagram shows how a very high frequency sound wave can be used to check for internal cracks in a large steel bolt. The oscilloscope trace shows that the bolt does have an internal crack. ...
... The diagram shows how a very high frequency sound wave can be used to check for internal cracks in a large steel bolt. The oscilloscope trace shows that the bolt does have an internal crack. ...
Ultrasound Primer / Basics
... The basic purpose of the transducer wear plate is to protect the transducer element from the testing environment. In the case of contact transducers, the wear plate must be a durable and corrosion resistant material in order to withstand the wear caused by use on materials such as steel. For immersi ...
... The basic purpose of the transducer wear plate is to protect the transducer element from the testing environment. In the case of contact transducers, the wear plate must be a durable and corrosion resistant material in order to withstand the wear caused by use on materials such as steel. For immersi ...
Notes-text only
... Poor resolution of soft tissues Major use is osteology Computed Tomography (CT Scan) Moving x-ray beam Image produced on a video monitor of a cross-section through body ...
... Poor resolution of soft tissues Major use is osteology Computed Tomography (CT Scan) Moving x-ray beam Image produced on a video monitor of a cross-section through body ...
Word Document
... pressure, creates a voltage potential. The reverse is also true. When a voltage is applied to the crystal, it generates a mechanical deformation. This property is key for ultrasound since the machine needs some way to make pressure (sound) waves. The piezoelectric crystals in the transducer can conv ...
... pressure, creates a voltage potential. The reverse is also true. When a voltage is applied to the crystal, it generates a mechanical deformation. This property is key for ultrasound since the machine needs some way to make pressure (sound) waves. The piezoelectric crystals in the transducer can conv ...
X-rays - TheWorldaccordingtoHughes
... scan) uses x-rays. In a CT scan the patient lies on a table and is moved though a doughnut-shaped machine. It creates images that are slices through the patient. It does this by moving the x-ray tube and detector in a circle taking xray images of the slice from all angles around the body. A computer ...
... scan) uses x-rays. In a CT scan the patient lies on a table and is moved though a doughnut-shaped machine. It creates images that are slices through the patient. It does this by moving the x-ray tube and detector in a circle taking xray images of the slice from all angles around the body. A computer ...
Introduction to Biomedical Imaging
... A single beam in an ultrasound scan can be used to produce an M-mode picture where movement of a structure such as a heart valve can be depicted in a wavelike manner. Because of its high sampling frequency (up to 1000 pulses per second) This is useful in assessing rates and motion and is still used ...
... A single beam in an ultrasound scan can be used to produce an M-mode picture where movement of a structure such as a heart valve can be depicted in a wavelike manner. Because of its high sampling frequency (up to 1000 pulses per second) This is useful in assessing rates and motion and is still used ...
Ultrasound Notes - El Camino College
... passes, but there are still many situations where X-rays produce a much higher resolution. 2. Ultrasound is reflected very strongly on passing from tissue to gas, or vice versa. This means that ultrasound cannot be used for examinations of areas of the body containing gas, such as the lung and the d ...
... passes, but there are still many situations where X-rays produce a much higher resolution. 2. Ultrasound is reflected very strongly on passing from tissue to gas, or vice versa. This means that ultrasound cannot be used for examinations of areas of the body containing gas, such as the lung and the d ...
Medical Physics
... cancerous tissues show up well on MRI images Cancer cells may contain hydrogen atoms that have different T1 and T2 relaxation times, and hence may form a contrast with the surrounding tissues MRI scans can identify areas of high blood flow because: Blood is a watery fluid – high blood flow means ...
... cancerous tissues show up well on MRI images Cancer cells may contain hydrogen atoms that have different T1 and T2 relaxation times, and hence may form a contrast with the surrounding tissues MRI scans can identify areas of high blood flow because: Blood is a watery fluid – high blood flow means ...
Sound in medicine
... on the Doppler effect. The wavelength of light varied according االسنان to the relative طبmotion of the source of light and the observer. * If the source or observer or both are moving toward each other, the light received will have a shorter wavelength (higher frequency) than the emitted. On t ...
... on the Doppler effect. The wavelength of light varied according االسنان to the relative طبmotion of the source of light and the observer. * If the source or observer or both are moving toward each other, the light received will have a shorter wavelength (higher frequency) than the emitted. On t ...
Document
... • Explain how ultrasound transducers emit and receive high-frequency sound; • Describe the principles of ultrasound scanning; • Describe the difference between A-scan and B-scan; • Calculate the acoustic impedance using the equation Z = ρc; • Calculate the fraction of reflected intensity • Describe ...
... • Explain how ultrasound transducers emit and receive high-frequency sound; • Describe the principles of ultrasound scanning; • Describe the difference between A-scan and B-scan; • Calculate the acoustic impedance using the equation Z = ρc; • Calculate the fraction of reflected intensity • Describe ...
Support worksheet – Option I Questions
... coefficient) is given by R 1 . State what fraction of the incident intensity is Z1 Z2 reflected when the two media have: ...
... coefficient) is given by R 1 . State what fraction of the incident intensity is Z1 Z2 reflected when the two media have: ...
Medical ultrasound
Medical ultrasound (also known as diagnostic sonography or ultrasonography) is a diagnostic imaging technique based on the application of ultrasound. It is used to see internal body structures such as tendons, muscles, joints, vessels and internal organs. The aim of often to find a source of a disease or to exclude any pathology. The practice of examining pregnant women using ultrasound is called obstetric ultrasound, and is widely used.Ultrasound is sound waves with frequencies which are higher than those audible to humans. Ultrasonic images also known as sonograms are made by sending pulses of ultrasound into tissue using a probe. The sound echoes off the tissue; with different tissues reflecting varying degrees of sound. These echoes are recorded and displayed as an image to the operator.Many different types of images can be formed using sonographic instruments. The most well-known type is a B-mode image, which displays the acoustic impedance of a two-dimensional cross-section of tissue. Other types of image can display blood flow, motion of tissue over time, the location of blood, the presence of specific molecules, the stiffness of tissue, or the anatomy of a three-dimensional region.Compared to other prominent methods of medical imaging, ultrasound has several advantages. It provides images in real-time, it is portable and can be brought to the bedside, it is substantially lower in cost, and it does not use harmful ionizing radiation. Drawbacks of ultrasonography include various limits on its field of view including patient cooperation and physique, difficulty imaging structures behind bone and air, and its dependence on a skilled operator.