radionuclide imaging of infection & inflammation · question 2 labeled leukocyte imaging is...
TRANSCRIPT
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Radionuclide Imaging of Infection & Inflammation
Christopher J. Palestro, M.D. Professor of Radiology
Hofstra North Shore-LIJ School of Medicine
Chief Division of Nuclear Medicine & Molecular Imaging North Shore-Long Island Jewish Health System
Manhasset & New Hyde Park, New York
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Disclosures
None
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Question 1
The characteristic appearance of acute interstitial nephritis on gallium-67 imaging is renal activity that is more intense than activity in the
A. Colon B. Liver C. Lumbar spine D. Spleen
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Question 2 Labeled leukocyte imaging is MOST sensitive
for detecting inflammations and infections in which the cellular response is primarily
A. Basophilic B. Eosinophilic C. Lymphocytic D. Neutrophilic
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Question 3 What are the effects of osteomyelitis on the uptake of
leukocytes and sulfur colloid by the bone marrow? A. Osteomyelitis stimulates bone marrow uptake of
leukocytes and sulfur colloid B. Osteomyelitis suppresses bone marrow uptake of
leukocytes and sulfur colloid C. Osteomyelitis stimulates bone marrow uptake of
sulfur colloid and suppresses uptake of leukocytes D. Osteomyelitis stimulates bone marrow uptake of
leukocytes and suppresses uptake of sulfur colloid
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Question 4 18F-FDG is useful in the evaluation of patients
with fever of unknown origin because this radiopharmaceutical is
A. Sensitive and has a high negative predictive value B. Sensitive and has a high positive predictive value C. Specific and has a high negative predictive value
D. Specific and has a high positive predictive value
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Question 5 What is an advantage of 18F-FDG compared to
99mTc-MDP for diagnosing osteomyelitis? A. 18F-FDG uptake is low in the bone marrow B. 18F-FDG uptake is high in degenerative
changes C. 18F-FDG uptake is high in bone tumors D. 18F-FDG uptake is low in trauma
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Radiopharmaceuticals Single Photon Emitters
67Ga-citrate Labeled leukocytes
In-vitro labeled leukocytes In-vivo labeled leukocytes
Infection specific agents Radiolabeled antibiotics Radiolabeled antimicrobial peptides
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Radiopharmaceuticals Positron Emitters
18F-FDG 18F-FDG-WBC 64Cu-WBC 64Cu-cFLFLF-PEG 68Ga-68 124I-fialuridine
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Gallium-67 Uptake Mechanisms
Transferrin delivery to inflammation Lactoferrin binding at inflammation Siderophore binding at inflammation Direct bacterial uptake (S. Aureus, E.coli) Macrophage uptake (via gallium receptors)
Leukocyte delivery to inflammation
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Normal Gallium Scans
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Indications for 67Ga Imaging Interstitial nephritis Opportunistic infections Severe leukopenia Pulmonary Inflammation Spinal osteomyelitis FUO Granulomatous diseases
Sarcoidosis Mycobacterial infections Chronic granulomatous disease
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67Ga & Interstitial Nephritis
Anterior Posterior
1. Differentiates acute interstitial nephritis from acute tubular necrosis (ATN) 2. Reliable only in acute renal failure 3. Image ≥ 48 hrs. post injection 4. Renal uptake > lumbar spine uptake
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Spinal Osteomyelitis
MRI: imaging procedure of choice Nuclear medicine
Useful adjunct when MRI Is equivocal Differs from clinical impression Cannot be performed Procedures
18F-FDG 67Ga-citrate
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Spinal Osteomyelitis
Gallium Enhances bone scan specificity Detects adjacent soft tissue infection May be more sensitive than bone scan (especially in elderly)
Bone Gallium
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Sarcoidosis
Gallium useful for: Extent of disease Monitor response to Rx Detect recurrent disease Scarring vs. active disease
Pre Rx Post Rx
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Active Disease vs. Scarring
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In-Vitro Labeled Leukocytes
111In-oxine 99mTc-exametazime
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In-vitro Labeled Leukocytes Uptake Mechanisms
Intact chemotaxis Number of cells labeled Type of cells labeled Predominantly neutrophils
Inflammatory response Most sensitive for neutrophil mediated inflammation/infection
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Acute Gouty Arthritis
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Sarcoidosis
111In-WBC 67Ga
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99mTc-WBC vs. 111In-WBC 99mTc-WBC 111In-WBC
Resolution ++++ ++ Biodistribution ++ ++++ Label stability ++ ++++ Delayed imaging ++ ++++ Dual isotope imaging
- ++++
SPECT/CT ++++ +
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Normal 111In-Labeled Leukocyte Study (24 hrs)
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Normal 99mTc-Labeled Leukocyte Study*
4 hrs 24 hrs
*10 mCi 99mTc-WBC, 15 cm/min 4hrs, 8 cm/min 24 hrs
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5 min 30 min 1 hr
2 hrs 4 hrs 24 hrs
Pulmonary Uptake of Labeled Leukocytes
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Labeled Leukocytes
• Do not accumulate in normally-healing surgical wounds
• Exceptions – Wounds healing by secondary intention – Ostomies – Skin grafts – Bleeding wounds
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Gastrointestinal Activity
Infection Inflammation Ischemia GI bleeding Swallowed WBC’s Following enemas
111In-WBC
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Indications for Labeled Leukocyte Imaging
Inflammatory bowel disease (IBD) Occult infection Postoperative infection Infection versus tumor Vascular graft infection Complicating osteomyelitis Orthopedic hardware Joint prostheses Diabetic pedal osteomyelitis Charcot joint Fever of unknown origin
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Cardiovascular System
Bacterial Endocarditis No (? SPECT/CT)
Mycotic Aneurysms Yes
Infected Prosthetic Yes Grafts
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Vascular Graft Infection
Sensitivity: 90% Specificity: 53%-90% False positives Thrombosis Hematoma Bleeding Recent placement (< 2 weeks)
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Central Nervous System
Meningitis: No Encephalitis: No Abscess: Yes
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Musculoskeletal Infection
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Marrow Expansion
Produces Altered uptake of leukocytes
Creates Difficulties in labeled leukocyte image interpretation
Solution 99mTc sulfur colloid marrow imaging
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Principle of Leukocyte/Marrow Imaging
Leukocytes and sulfur colloid both accumulate in marrow
Leukocytes accumulate in osteomyelitis; sulfur colloid does not
Image interpretation: Activity on labeled leukocyte image without corresponding activity on bone marrow image = osteomyelitis
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Leukocyte/Marrow Imaging
111In-WBC 99mTc-SC
Osteomyelitis Lt. Humerus
Hypercellular Marrow Lt. Humerus (SSD)
99mTc-WBC 99mTc-SC
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Scrutinize the Joint!!
Infected Rt. THR
Infected Rt. TKR
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Nodal Activity (Hips)
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111In-WBC 99mTc-SC
Nodal Activity (Knees) Posterior
Right lateral
←
→
←
→
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99mTc-Sulfur Colloid Breakdown
111In-WBC 99mTc-SC 99mTc-SC
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Spinal Osteomyelitis 50%: nonspecific photopenic defects on
WBC images WBC/marrow imaging generally is not
useful
111In-WBC 99mTc-SC
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Tracer N= SPECT Accuracy
SPECT CT Accuracy
Horger Arch Orthop Trauma Surg. 2007
99mTc-MDP 31 58% 84%
Horger EJNMMI 2003
99mTc-Besilesomab
27 59% 97%
Filippi JNM 2006
99mTc-WBC 28 64% 100%
SPECT/CT
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SPECT/CT
Author Tracer N= SPECT/CT contributory in
Bar Shalom JNM 2006
67Ga 47 36%
111InWBC 35 61%
Moschilla WJNM 2006
67Ga
7 100%
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Soft Tissue Infection (111In-WBC)
Anterior Posterior
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Lt. Mandibular Osteomyelitis
111In-WBC
111In-WBC 99mTc-SC
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In-vitro Labeled WBC’s
99mTc vs. 111In 99mTc-WBC
111In-WBC
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Dual Isotope Planar Images Infected Lt. THR
111In-WBC 99mTc-SC
Anterior
Posterior
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Dual Isotope SPECT/CT Infected Lt. THR
111In-WBC 99mTc-SC
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SPECT/CT & Prosthetic Joints
Think out of the Box! Extent of Infection Other causes of pain Loosening Fracture Particle disease Etc. CT guided joint aspiration
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Unanswered Questions About WBC Imaging
Effect of antibiotics on sensitivity Effect of steroids on sensitivity Monitoring response to treatment
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In-vitro Labeled Leukocytes: Disadvanatges
Not infection specific Labeling procedure Labor intensive Blood handling
Availability Dual isotope imaging for MSK infection Suboptimal resolution Interval between injection & imaging
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In-vivo Labeled Leukocytes
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Antigranulocyte Antibodies
99mTc-Besilesomab Murine monoclonal G1 immunoglobulin Binds to NCA-95 on leukocytes Disadvantages High bone marrow uptake High HAMA incidence HAMA prescreening Single use
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Antigranulocyte Antibodies
99mTc-Fanolesomab Murine monolconal M immunoglobulin Binds to CD-15 receptors on leukocytes Disadvantages Safety issues (No longer available)
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Antigranulocyte Antibodies
99mTc-Sulesomab Murine monoclonal G1 immunoglobulin fragment Binds to NCA-90 on leukocytes No HAMA Disadvantages Uptake mechanism issues
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99mTc-Interleukin-8 (IL-8)
CXC subfamily of chemokines Binds to CXC1 and CXC2 receptors
on neutrophils
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99mTc-Ciprofloxacin Rapidly inhibits bacterial DNA synthesis → rapid bacterial cell death Inhibits enzymatic activities of the enzymes DNA gyrase and topoisomerase IV, promotes cleavage of DNA in these enzyme–DNA complexes - Gram (+) bacteria: DNA gyrase - Gram (-) bacteria: topoisomerase IV
Radiolabeled Antibiotics
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99mTc-Ciprofloxacin
2 hrs. 4 hrs. 24 hrs.
Aseptically Loosened Right TKR
Infected Right TKR
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Radiolabeled Antimicrobials
Critical role in biological defense system of multicellular organisms
Bind to bacterial cell membrane Expression constant or induced on microbial
contact May be transported to infection by leukocytes
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Ubiquicidin Human antimicrobial peptide
Targets bacteria Radiolabeled synthetic fragments (99mTc-UBI 18-35 and UBI 29-41) Rapidly detect gram-positive and gram-negative infections No accumulation in sterile inflammation Initial human investigations encouraging
Human Beta-Defensin-3 (HBD-3)
Radiolabeled Antimicrobials
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18F-FDG
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18F-FDG
Cellular uptake related to cellular metabolic rate & number of glucose transporters
Transported into cells via glucose transporters
glucose transporters in activated inflammatory cells
affinity of glucose transporters for FDG 2° to cytokines & growth factors
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18F-FDG Small molecule
Enters poorly perfused regions rapidly High resolution images High sensitivity (> 90%) Minimal uptake in normal bone marrow
Uptake in uninfected fractures normalizes quickly (3-4 months)
Low uptake in degenerative bone disease Accurate in chronic osteomyelitis No blood handling
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Fever of Unknown Origin
Radionuclide studies typically performed after all other tests are negative
Majority yield negative results Traditional approach: 111In-WBC and/or 67Ga
(up to 5 days to complete) 21st Century: 18F-FDG
High sensitivity & negative predictive value Negative result: unlikely that focal source of FUO will be identified.
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Vasculitis
Very sensitive (77-92%) for detecting large vessel vasculitis (giant cell arteritis)
Useful for Determining extent of disease Monitoring response to therapy Less useful in Immunosuppressed patients Medium & small vessel disease Temporal arteritis Polyarteritis nodosa
Giant Cell Arteritis
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Sarcoid
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FDG & Inflammatory Bowel Disease
99mTc-WBC 18F-FDG Sensitive Yes Yes
Crohn vs. Colitis Yes ?
Monitoring Rx Response
Yes ?
Active Disease versus Scarring
Yes ?
IBD vs. IBS ? ?
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Ulcerative Colitis
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Diabetic on Metformin
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Vascular Graft Infection
Spacek et al. (EJNMMI 2009;36:850-8) (n=96)
Focal FDG uptake + irregular lesion boundary on CT had PPV = 97% No focal uptake + smooth boundaries on CT had NPV of 95% FDG PET/CT provided definitive diagnosis in about 75% of cases
Wasselius et al. (J Nucl Med 2008;49:1601-5) (n=16) 16 vascular grafts demonstrated FDG uptake. 1 was infected.
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16 Uninfected Vascular Grafts*
14 (87.5%) grafts demonstrated FDG uptake 3: focal 4: diffuse heterogeneous 7: diffuse homogeneous
SUV’s Graft: 3-8.7 Graft/Blood pool: 1.25-3.62 Values similar to infected grafts
5 grafts: little change over 2 yrs. *Tomas SNM 2012
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Asymptomatic Aortic Graft
Sept 2006
July 2007
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Musculoskeletal Infection
High sensitivity > 90%
Minimal uptake in normal bone marrow Uptake in uninfected fractures rapidly normalizes
(3-4 months) Accurate in chronic osteomyelitis
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FDG in Spinal Osteomyelitis Author N= Sens Spec Acc Guhlman JNM (1998)
4 3/3 1/1 4/4
Kalicke EJNM (2000)
7 7/7 NA NA
Meller EJNM (2002)
9 4/4 5/5 9/9
Gratz EJNM (2002)
16 12/12 3/4 15/16
Stumpe AJR (2002)
38 5/5 33/33 38/38
deWinter Spine(2003)
57 15/15 100%
34/42 81%
49/57 86%
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FDG & Spinal Osteomyelitis (+)
(-)
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The Diabetic Foot
↓
?
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FDG & Joint Replacements*
Infected Rt. TKR
Aseptically Loosened Lt. TKR
* Courtesy F. Gemmel, MD
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Summary Gallium
Opportunistic infections, interstitial nephritis, pulmonary inflammation, severe leukopenia
In-vitro labeled leukocytes Most infections in immunocompetent patients
FDG FUO, vasculitis, spinal osteomyelitis, granulomatous diseases (mycobacterial, sarcoid, etc)
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The Future
What do we need? A radiopharmaceutical that is Safe Specific for infection Ubiquitously available Rapidly completed and Yields high resolution images
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SAM Questions
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Question 1
The characteristic appearance of acute interstitial nephritis on gallium-67 imaging is renal activity that is more intense than activity in the
A. Colon B. Liver C. Lumbar spine D. Spleen
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Answer
The characteristic appearance of acute interstitial nephritis on gallium-67 imaging is renal activity that is more intense than activity in the
A. Colon B. Liver C. Lumbar spine D. Spleen
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Question 2 Labeled leukocyte imaging is MOST sensitive
for detecting inflammations and infections in which the cellular response is primarily
A. Basophilic B. Eosinophilic C. Lymphocytic D. Neutrophilic
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Answer Labeled leukocyte imaging is MOST sensitive
for detecting inflammations and infections in which the cellular response is primarily Gout Sarcoid
A. Basophilic B. Eosinophilic C. Lymphocytic D. Neutrophilic
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Question 3 What are the effects of osteomyelitis on the uptake of
leukocytes and sulfur colloid by the bone marrow? A. Osteomyelitis stimulates bone marrow uptake of
leukocytes and sulfur colloid B. Osteomyelitis suppresses bone marrow uptake of
leukocytes and sulfur colloid C. Osteomyelitis stimulates bone marrow uptake of
sulfur colloid and suppresses uptake of leukocytes D. Osteomyelitis stimulates bone marrow uptake of
leukocytes and suppresses uptake of sulfur colloid
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Answer What are the effects of osteomyelitis on the uptake of
leukocytes and sulfur colloid by the bone marrow? A. Osteomyelitis stimulates bone marrow uptake of
leukocytes and sulfur colloid B. Osteomyelitis suppresses bone marrow uptake of
leukocytes and sulfur colloid C. Osteomyelitis stimulates bone marrow uptake of
sulfur colloid and suppresses uptake of leukocytes D. Osteomyelitis stimulates bone marrow uptake of
leukocytes and suppresses uptake of sulfur colloid
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Answer What are the effects of osteomyelitis on the uptake of
leukocytes and sulfur colloid by the bone marrow? D. Osteomyelitis stimulates bone marrow uptake of
leukocytes and suppresses uptake of sulfur colloid
Infected Rt. THR
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Question 4 18F-FDG is useful in the evaluation of patients
with fever of unknown origin because this radiopharmaceutical is
A. Sensitive and has a high negative predictive value B. Sensitive and has a high positive predictive value C. Specific and has a high negative predictive value
D. Specific and has a high positive predictive value
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Question 4 18F-FDG is useful in the evaluation of patients
with fever of unknown origin because this radiopharmaceutical is
A. Sensitive and has a high negative predictive value B. Sensitive and has a high positive predictive value C. Specific and has a high negative predictive value
D. Specific and has a high positive predictive value
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Question 5 What is an advantage of 18F-FDG compared to
99mTc-MDP for diagnosing osteomyelitis? A. 18F-FDG uptake is low in the bone marrow B. 18F-FDG uptake is high in degenerative
changes C. 18F-FDG uptake is high in bone tumors D. 18F-FDG uptake is low in trauma
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Answer What is an advantage of 18F-FDG compared to
99mTc-MDP for diagnosing osteomyelitis? A. 18F-FDG uptake is low in the bone marrow B. 18F-FDG uptake is high in degenerative
changes C. 18F-FDG uptake is high in bone tumors D. 18F-FDG uptake is low in trauma