About this Program

In this session, the role of fat as a radiographic diagnostic tool will be discussed. The five (5) basic radiographic densities will be introduced; in particular the low contrast resolution between water and fat radiographic densities.  Adipose tissue is located throughout our bodies, and its radiographic visualization plays an important part in the diagnostic interpretive process for the radiologist. It is often under-appreciated and in this session we will look at its radiographic significance with various diagnostic imaging examinations including the elbow, wrist, knee ankle, abdomen and bony fractures.

Educational Objectives

Upon completion of this webinar, the participant should be able to:


  • Identify the five(5) basic radiographic densities on any radiographic image.
  • Explain the interpretive process of radiographic density visualization.
  • Discuss low contrast resolution(LCR) and its importance in image interpretation.
  • Explain the clinical importance of adipose in various body compartments, from a diagnostic viewpoint.
  • Identify several body structures that demonstrate radiographic shadow formation based upon adipose distribution.
  • Explain the radiographic clinical interpretive importance of adipose in the elbow, knee, ankle and wrist joints as well as the abdomen.
  • Discuss the development of a lipohaemoarthrosis and its radiographic and clinical significance.
  • Point out the process of tissue effusion and its impact upon fat visualization.
  • Suggest methods/techniques that could be utilized to optimize LCR and adipose visualization.


In-person and live webinar options


  • Challenges of image interpretation
  • Image quality and perceived resolution
  • Assessment of image quality

Five Basic Radiographic Densities

  • Experiment to demonstrate radiographic densities
  • Experiment demonstrating loss of contrast with densities
  • Examples of images demonstrating the radiographic densities
  • Adipose as a tissue density
    • average atomic density(Z#)
    • comparison to other tissue densities and Z#

Low Contrast Resolution (LCR)

  • What is LCR?
  • LCR and digital detector technologies
  • Imaging modalities and LCR
  • LCR and image noise
  • Images of Experiment on LCR and beam hardening

Clinical Significance of Fat

  • Elbow fat pads
  • Paraspinal fat stripes
  • Renal fat and fascia
  • Properitoneal fat stripes
  • Hoffa’s fat pad
  • Kager’s triangle
  • Pronator fat stripe

Clinical Examples of Radiographic Fat

  • Lipohemoarthosis
    • explanation and clinical significance
    • importance of positioning and patient at rest
  • Ship’s sail sign
    • importance of positioning
  • Asymmetry of fat stripes
  • Effusion of fat compartments and radiographic visualization

Image Analysis


Who should attend?

  • Radiologic Technologists
  • Medical Imaging Specialists
  • Educators
  • Vendor Personnel

Program Faculty

Meet your presenter(s)

Randy Griswold

Randy Griswold


Randy has been in the medical imaging profession for over 40 years as an educator, sales and marketing professional and consultant. Currently he is a contributing author and medical imaging consultant. Prior to that, he was the Director of Sales and Marketing for a Midwest distributor of digital medical imaging products. His collective experiences as an educator include being the Program Director for Bellin College, School of Radiologic Sciences and their BSRS program. He was instrumental in transforming their two-year certificate program to a four-year, accredited BSRS degree program.

Randy has 23 years of experience in radiology capital equipment sales, service and support including digital imaging, and has completed his graduate work in Public Service Administration with an emphasis in Health Care Administration and Medical Imaging Marketing. He is a past president of the Wisconsin Association of Educators in Radiologic Technology (WAERT) and the Wisconsin Society of Radiologic Technologists (WSRT) as well as being a Fellow. His passion for teaching is focused on helping technologists understand the importance of obtaining good quality images for diagnosis, in a fashion that uses the skills and techniques of radiologist interpretation.


Accredited training programs

ASRT Category A Credit Information

ASRT Category A

This program provides 2 hour(s) of Category A continuing education credit for radiologic technologists approved by ASRT and recognized by the ARRT and various licensure states.  Category A credit is also recognized for CE credit in Canada.  You must attend the entire program to receive your certificate of completion.  


Convenient payment options available

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Early Pricing Guidelines

Qualifying 'Early' registrations must be made at least 4 days in advance for the program.

Cancellation Policy

Webinars less than 8 hours of credit

Refunds, minus a $15 processing fee, will be granted for cancellations received at least 3 days prior to the program. Cancellations received within 3 days of the webinar will receive a credit toward a future MTMI program, minus the $15 processing fee. No refunds will be made after the webinar starts. MTMI reserves the right to cancel any scheduled program because of low advance registration or other reasons. MTMI’s liability is limited to a refund of any program tuition paid. WEBINAR ATTENDEES that cannot log in due to unsolvable technical issues beyond their control will be eligible for a full refund.