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| Course: DMS150 First Term: 2015 Fall
Final Term: Current
Final Term: 2020 Fall
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Lecture 2.0 Credit(s) 2.0 Period(s) 2.0 Load
Credit(s) Period(s)
Load
Subject Type: OccupationalLoad Formula: S - Standard Load |
| MCCCD Official Course Competencies | |||
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| 1. Describe sound waves, propagation of ultrasound through tissue, reflection, refraction, and scattering. (I, II, IV)
2. Explain transducer technology, and discuss the advantages and limitations of the various types. (III) 3. Describe the role of advanced scanning features, including harmonics, coded excitation, and compounding. (IV) 4. Describe the function of the major components of the ultrasound system (IV, V) | |||
| MCCCD Official Course Competencies must be coordinated with the content outline so that each major point in the outline serves one or more competencies. MCCCD faculty retains authority in determining the pedagogical approach, methodology, content sequencing, and assessment metrics for student work. Please see individual course syllabi for additional information, including specific course requirements. | |||
| MCCCD Official Course Outline | |||
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I. Basic Principles and Wave Analysis
A. General Principles 1. Scientific notation 2. Metric notation 3. Common units a. Time - sec b. Power - watts c. Work - joule d. Acoustic impedance - rayls 4. Measurement dimensions a. Distance (1). Linear (2). Circumference b. Area c. Volume B. Nature of Sound 1. Definition of sound a. Wave classifications (1). Electromagnetic (2). Mechanical (a). Longitudinal (b). Transverse b. Wave anatomy (1). Cycle (a). Phase (b). Frequency (c). Period (d). Wavelength (2). Compression (3). Rarefaction (4). Nodes/antinodes 2. Acoustic spectrum a. Infrasound b. Audible sound c. Ultrasound 3. Sound wave interaction/interference a. Huygen`s principle b. Constructive c. Destructive d. Beat frequency 4. Types of waves a. Continuous wave b. Pulse wave characteristics, units, and ranges (1). Pulse repetition frequency (2). Pulse repetition period (3). Pulse duration (4). Spatial pulse length (5). Duty factor C. Wave Characteristics 1. Definition of terms a. Propagation speed b. Frequency (1). Typical ranges (2). Penetration c. Wavelength d. Acoustic impedance 2. Relationship between terms 3. Common units of terms 4. Acoustic variable a. Density b. Pressure c. Temperature d. Particle motion D. Properties of Acoustic Waves 1. Amplitude 2. Pressure 3. Power 4. Intensity E. Decibels 1. Definition a. Related to intensity b. Related to amplitude 2. Examples corresponding to half value layers II. Propagation of Acoustic Waves through Tissues A. Speed of Sound 1. Average speed in tissues 2. Range of propagation speeds in the body a. Air b. Water c. Muscle d. Fat e. Various parenchyma f. Bone g. Average for soft tissue 3. Media properties a. Elasticity b. Density c. Compressibility/bulk modulus d. Relationship between properties B. Reflection 1. Definition of reflection 2. Specular reflector and highlights a. Interface size and contour b. Dependence on angle c. Dependence on acoustic impedance mismatch (1). Definition of acoustic impedance (2). Common units (3). Determine ease of reflection versus transmission 3. Scatter a. Definition of scattering b. Frequency dependence c. Interface contour d. Contrast media C. Refraction 1. Definition of refraction 2. Snell`s law D. Attenuation 1. Definition of attenuation 2. Sources of attenuation a. Reflection/Scattering b. Refraction c. Interference d. Diffusion e. Absorption 3. Dependence on frequency 4. Typical values in soft tissue 5. Relationship between coefficient, depth, frequency 6. Effects on images a. Frequency versus spatial resolution b. Penetration versus spatial resolution E. Harmonics 1. Tissue harmonics versus contrast harmonics 2. Generation of odd or even multiples of original frequency wave 3. Effect of high pressure area on sound wave 4. System requirements a. Wide dynamic range b. Transmitter c. Bandwidth/passband limitations 5. Advantages and limitations 6. Clinical applications III. Sonographic Transducers and Sound Beams A. Piezoelectric Properties 1. Definition of piezoelectric effect 2. Curie point 3. Dipole alignment process 4. Piezoelectric materials B. Transducer Construction and Characteristics 1. Transducer housing a. Protective b. Orientation c. Care 2. Backing material a. Insulation b. Damping (1). Relationship of damping, pulse length, axial resolution, sensitivity (2). Passive versus dynamic damping 3. Matching layer a. Purpose of matching layer b. Relationship to wavelength, pulse length, sensitivity 4. Crystal/Element a. Resonant, operating versus nominal frequency b. Dependence of crystal thickness to resonance frequency c. Frequency characteristics (1). Bandwidth (a). Narrow versus broad bandwidth (b). Effect of damping (c). Q factor C. Sound Beam Formation and Beam Shape 1. Definition of near field/Fresnel zone a. Length of near field (1). Relationship to transducer frequency and crystal diameter b. Shape of near field (1). Beam width (2). Natural focus 2. Definition of far field/Fraunhofer zone a. Shape of far field (1). Relationship to transducer frequency and crystal diameter 3. Focused beam a. Definition of focal plane, focal point, focal distance, focal zone (1). Maximum versus minimal areas of beam intensity b. Method of focusing (1). Single element/mechanical transducers (2). Multi-element/dynamic transducers c. Clinical uses with variable focuses d. Interference phenomena (1). Huygen`s principle (2). Diffraction (divergence) (3). Bandwidth 4. Pressure profiles a. Identify axial, transverse, and polar pressure profiles b. Relationship between bandwidth and each profile c. Axial profile labeling (1). Pressure axis (2). Central beam axis (3). Near field (4). Far field (5). Application to assess near field and far field fluctuations d. Transverse profile labeling (1). Pressure axis (2). Beam width axis (3). Distance from transducer axis (4). Application to provide beam diameter information e. Polar profile labeling (1). Pressure axis (2). Angle theta (3). Main lobe (4). Side lobe (5). Application to provide information about energies outside of main beam D. Axial Resolution 1. Dependence on spatial pulse length/ pulse duration, damping, bandwidth 2. Relationship to transducer frequency 3. Numerical example E. Lateral Resolution 1. Dependence on beam width, transducer frequency, transducer size, focal length F. Relationship from Transducer Face G. Slice Thickness or Elevational Resolution 1. Dependence on beam width, focal characteristics, and frequency 2. Relationship to lateral and axial resolution H. Transducer Types 1. Mechanical construction/operation a. Contact b. Liquid-path 2. Multiple element construction a. Linear array b. Curved array c. Annular array d. Multi-dimensional array 3. Electronic operation a. Sequenced b. Phased/simultaneous c. Annular/hybrid d. Multi-dimensional e. Beam steering (1). Transmission time delays (2). Reception time delays f. Beam focusing (1). Time delays (2). Dynamic aperture g. Firing variations (1). Apodization (2). Subdicing 4. Emerging technologies I. Transducer Care and Maintenance 1. Effects of alcohol, autoclave, and physical damage 2. Proper cleansing routine IV. Principles of Pulse Echo Imaging A. A-mode 1. Information displayed on image a. Amplitude, depth/time 2. Advantages and disadvantages 3. Clinical applications B. M-mode 1. Information displayed on image a. Amplitude, depth, time 2. Advantages and disadvantages 3. Clinical applications C. B-mode 1. Information displayed on image a. Amplitude, depth 2. Advantages and disadvantages 3. Clinical applications D. Volumetric Scanning Modes 1. Definition of voxel 2. Information displayed on image 3. Orthogonal planes 4. Advantages and disadvantages 5. Clinical applications E. Scanning Speed Limitations 1. Definition of range equation 2. Real-time systems-relationships between a. Pulse repetition frequency b. Frame rate c. Number of lines per frame d. Number of focal regions e. Field of view or sector angle f. Image depth/penetration g. Spatial resolution h. Temporal resolution F. System Controls 1. Purpose and definition a. Freeze b. Print c. Depth/field of view (FOV) d. Focus e. Overall gain f. Time gain compensation (TGC) g. Transducer frequency selection (1). Examination presets h. Calipers 2. Information displayed on image a. Amplitude, depth/time 3. Clinical applications G. Time-gain Compensation M-mode 1. Information displayed on image a. Amplitude, depth, time 2. Advantages and disadvantages 3. Clinical applications H. B-mode 1. Information displayed on image a. Amplitude, depth 2. Advantages and disadvantages 3. Clinical applications I. Volumetric Scanning Modes 1. Definition of voxel 2. Information displayed on image 3. Orthogonal planes 4. Advantages and disadvantages 5. Clinical applications J. Scanning Speed Limitations 1. Definition of range equation 2. Real-time systems-relationships between a. Pulse repetition frequency b. Frame rate c. Number of lines per frame d. Number of focal regions e. Field of view or sector angle f. Image depth/penetration g. Spatial resolution h. Temporal resolution K. System Controls 1. Purpose and definition a. Freeze b. Print c. Depth/field of view (FOV) d. Focus e. Overall gain f. Time gain compensation (TGC) g. Transducer frequency selection (1). Examination presets h. Calipers i. Power/Mechanical Index (MI)/Thermal Indices (TI) j. Cine loop k. Harmonics l. Compound imaging m. Extended field of view n. Scan modes o. Emerging technologies V. Sonographic Instrumentation A. System Components 1. Beam former 2. Signal processor 3. Image processor B. Timer 1. Range equation C. Transmitter/Pulse Generator 1. Effect of transmitter voltage on penetration, intensity, and patient exposure D. Receiver 1. Amplification a. Controlled by overall gain knob b. Effect on returning signal and image 2. Compensation a. Depth attenuation b. Controlled by TGC c. Effect on return signal and image 3. Compression a. Definition of dynamic range 1) Ranges associated with system components 2) Typical units 4. Demodulation a. Rectification 1) Half-wave 2) Full-wave b. Smoothing/enveloping 5. Rejection a. Signal to noise ratio b. System control for rejection E. Image Storage Devices 1. Role of scan converter a. Image storage b. Scan Conversion 2. Digital Devices a. Binary system 1) Bits, bytes, words, pixels 2) Nature of binary numbers b. Steps in processing echo information 1) Analog-to-digital converter a) Types of sampling b) Effects of sampling frequency 2) Preprocessing 3) Digital memory a) Spatial resolution b) Contrast resolution c) Post processing d) Digital-to-analog converter e) Display devices F. Imaging Processing 1. Preprocessing functions a. Time gain compensation b. Logarithmic compression curves c. Write magnification d. Panning e. Other 2. Postprocessing functions a. Freeze frame b. Black/white inversion c. Read magnification d. Contrast variation curves e. B-color f. Other 3. Manufacturer dependent functions a. Persistence b. Frame averaging c. Edge enhancement d. Smoothing e. Interpolation f. Emerging technologies g. Other G. Scanning Speed Limitations 1. Range equation 2. Real-time system relationships a. Pulse repetition frequency b. Frame rate c. Number of lines per frame d. Number of focal regions e. Field of view or sector angle f. Image depth/penetration g. Spatial resolution h. Temporal resolution H. Display Devices I. Recording and Archiving Devices 1. Analog format a. Display b. Single, multi-image, or laser cameras 1) Photographic film 2) Emulsion film c. Recorders d. Printer 1) Thermal 2) Laser 2. Digital format a. Digital media b. Picture archiving and communication systems (PACS) 1) Digital imaging and communications in medicine (DICOM) a) Industry standards | |||
MCCCD Governing Board Approval Date: June 16, 2015 | |||