

Radiography and CT of Adult Large-Bowel Obstruction
A review of the imaging findings in multiple causes of large bowel obstruction and a comparison with acute colonic pseudo-obstruction.
Course ID: Q00469 Category: Radiology Trends for Technologists Modalities: CT, Radiography2.0 |
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$24.00
- Targeted CE
- Outline
- Objectives
Targeted CE per ARRT’s Discipline, Category, and Subcategory classification:
[Note: Discipline-specific Targeted CE credits may be less than the total Category A credits approved for this course.]
Computed Tomography: 1.50
Procedures: 1.50
Abdomen and Pelvis: 1.50
Radiography: 0.50
Procedures: 0.50
Head, Spine and Pelvis Procedures: 0.50
Registered Radiologist Assistant: 2.00
Procedures: 2.00
Abdominal Section: 2.00
Outline
- Introduction
- Clinical Findings and Pathophysology
- Abdominal Radiography Technique
- Merits of Abdominal Radiography
- Challenges of Abdominal Radiography in Patients with LBO
- Multidetector CT
- CT Technique
- Pitfalls of CT Imaging of LBO
- The Contrast Enema
- LBO: Major Causes
- Colon Carcinoma
- Volvulus
- Sigmoid Volvulus
- Cecal Volvulus
- Transverse Colon Volvulus
- Diverticulitis
- Adult Intussusception
- Intraluminal Contents Causing LBO
- Hernias
- Inflammatory Bowel Disease
- Adhesions
- External Compression
- ACPO or Ogilvie Syndrome: An Important Mimic of LBO
Objectives
Upon completion of this course, students will:
- identify the cancer type that represents the vast majority of malignant head and neck tumors in adults
- list the particles used in external beam radiation therapy for head and neck tumors
- describe the currently preferred radiation therapy option for the head and neck
- identify the IMRT dose range delivered to high-risk areas
- list the imaging techniques that are routinely used in clinical practice to evaluate head and neck cancers
- describe pathologies that exhibit increased water diffusion on DW imaging
- explain the units of measurement of the apparent diffusion coefficient (ADC)
- understand the diagnostic capabilities of FDG PET/CT for detection of head and neck SCC
- recognize the value of FDG PET/CT in the evaluation of head and neck SCC
- list the pathologies that may demonstrate increased FDG uptake and lead to false-positive PET/CT image findings
- describe the mean SUV range of head and neck SCCs at FDG PET/CT imaging
- list the hybrid imaging system design that uses MR imaging-based attenuation correction maps to calculate SUVs
- compare the SUVs of focal lesions calculated at PET/MR with those calculated at PET/CT
- describe the timing of early effects of high-dose radiation therapy
- list the tissue types that typically demonstrate late effects of irradiation
- list the late effects of radiation therapy
- list the areas affected by radiation therapy-induced superficial lymphedema
- describe the tissue features present in a mature scar
- identify the imaging features that occur in the presence of scar tissue
- define the imaging feature known as “evil gray”
- list the body areas that may demonstrate high physiologic nonspecific FDG uptake
- describe atypical locations of brown fat
- recognize the diagnostic technique used to detect local mucosal destruction
- describe the imaging characteristics of soft-tissue necrosis following administration of gadolinium contrast agents
- identify the diagnostic techniques recommended for correlation with morphologic imaging when differentiating recurrent disease from benign soft-tissue necrosis
- understand the time frame for the occurrence of osteoradionecrosis after radiation therapy
- recognize the increased risk for osteoradionecrosis associated with radiation therapy doses of 62-70 Gy
- list the most reliable imaging signs of osteoradionecrosis
- describe the percentage of patients who may demonstrate chondroradionecrosis with recurrent tumor
- recognize the most common manifestation of radiation therapy-induced arteriopathy in the head and neck
- understand the effect of radiation therapy in the risk for development of thyroid disorders
- identify the brain region typically involved with radiation therapy-induced brain necrosis
- list the predisposing factors for radiation therapy-induced optic neuropathy
- list the pathologies that may lead to radiation therapy-induced tumors in the head and neck
- describe the imaging techniques that have limited value for precise assessment of deep tumor spread in the irradiated neck
- identify the diagnostic technique that may be superior to PET/CT, CECT, and MR imaging for detection of small metastatic nodes
- describe the diagnostic capabilities of FDG PET when investigating recurrent tumors and nodes after radiation therapy
- understand the impact of the positive predictive value of PET/CT in the evaluation of recurrent tumors
- list the areas where second primary tumors in patients with head and neck SCC recurrence are most often detected
- define miscoregistration due to geometric distortion
- describe the parameters of PET reconstructions in the head and neck
- list the imaging findings of peritumoral inflammation
- describe the percentage of thyroid incidentalomas that can be malignant
- identify the pathologic condition that exhibits very low signal intensity on both T1- and T2-weighted MR images
- identify the pathologic condition that demonstrates low ADCs