Positron Emission Tomography in the Diagnosis and Staging of Urinary Bladder Cancer

1996 ◽  
Vol 37 (1P1) ◽  
pp. 180-185 ◽  
Author(s):  
H. Ahlström ◽  
P.-U. Malmström ◽  
H. Letocha ◽  
J. Andersson ◽  
B. Långström ◽  
...  
Keyword(s):  
Positron Emission Tomography ◽  
Urinary Bladder ◽  
Bladder Carcinoma ◽  
Tnm Classification ◽  
Primary Tumour ◽  
Urinary Bladder Cancer ◽  
Emission Tomography ◽  
Urinary Bladder Carcinoma ◽  
Positron Emission ◽  
Before And After

Purpose: Evaluation of positron emission tomography (PET) using 18F-2-fluoro-2-deoxy-d-glucose (18FDG) and l-methyl-11C-methionine in the diagnosis and staging of urinary bladder carcinoma. Material and Methods: Twenty-three patients with biopsy-proven urinary bladder carcinoma were examined with PET after intravenous injection of 11C-methionine; 2 were also examined with 18FDG. The results from the PET investigations were compared with CT or MR findings and TNM classification before and after treatment. Results: The urinary excretion of 18FDG prevented distinction of the primary tumour from the surrounding tracer. With 11C-methionine it was possible to detect 18/23 primary tumours. A trend was seen, suggesting that the higher the uptake values of 11C-methionine in the tumour, the greater the tumour stage. Conclusion: It is possible to visualize urinary bladder tumours larger than 1 cm in diameter with PET using 11C-methionine, but the value of the method in the staging of the lesions is not superior to conventional methods.

Positron Emission Tomography in the Diagnosis and Staging of Urinary Bladder Cancer

1996 ◽  
Vol 37 (2) ◽  
pp. 180-185 ◽  
Author(s):  
H. Ahlstrom ◽  
P. -U. Malmstrom ◽  
H. Letocha ◽  
J. Andersson ◽  
B. Långstrom ◽  
...  
Keyword(s):  
Positron Emission Tomography ◽  
Bladder Cancer ◽  
Urinary Bladder ◽  
Urinary Bladder Cancer ◽  
Emission Tomography ◽  
Positron Emission

scholarly journals Positron Emission Tomography in the Diagnosis and Staging of Urinary Bladder Cancer

1996 ◽  
Vol 37 (2) ◽  
pp. 180-185
Author(s):  
H. Ahlström ◽  
P.-U. Malmström ◽  
H. Letocha ◽  
J. Andersson ◽  
B. Långström ◽  
...  
Keyword(s):  
Positron Emission Tomography ◽  
Bladder Cancer ◽  
Urinary Bladder ◽  
Urinary Bladder Cancer ◽  
Emission Tomography ◽  
Positron Emission

Positron Emission Tomography with 11C-Methionine and Computed Tomography of Intracranial Tumours Compared with Histopathologic Examination of Multiple Biopsies

1987 ◽  
Vol 28 (6) ◽  
pp. 673-681 ◽  
Author(s):  
M. Mosskin ◽  
H. von Holst ◽  
M. Bergström ◽  
V. P. Collins ◽  
L. Eriksson ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Positron Emission Tomography ◽  
Contrast Medium ◽  
Mass Effect ◽  
Tumour Cells ◽  
Emission Tomography ◽  
Normal Brain ◽  
Positron Emission ◽  
Multiple Biopsies ◽  
Before And After

A selected group of 36 patients with suspected supratentorial gliomas were investigated with positron emission tomography (PET) using 11C-methionine and transmission computed tomography (CT) before and after intravenous injection of contrast medium. Every examination was performed with the head fixed in a plastic helmet and a baseplate to guarantee that the slice orientation was the same at examinations with the two modalities and over time. Guided by the examinations, multiple stereotactic biopsies were performed with the biopsy instrument mounted on the baseplate. Regional accumulation of methionine was compared with histology of the corresponding samples and with attenuation before and after injection of contrast medium as well as mass effect on CT. Typically, there was a low attenuating lesion with a slight mass effect on CT. There was an increased accumulation compared with normal brain tissue in 31 cases of tumours and ordinary or decreased accumulation in 3 cases of tumours. In 22 cases with increased accumulation of methionine the extension of the tumour judged by PET corresponded with that of histology. In 4 cases tumour cells were found outside the area with pathologic methionine uptake. In 5 patients there were areas with increased methionine accumulation where no tumour cells were found. In 22 cases PET using methionine was more accurate than CT in defining the tumour boundaries as determined from the histologic findings. Four groups of biopsy specimens with different amounts of methionine accumulation are described. The uptake in a single biopsy gives good but not exact information about the histology of the specimen.

scholarly journals Preclinical Incorporation Dosimetry of [18F]FACH—A Novel 18F-Labeled MCT1/MCT4 Lactate Transporter Inhibitor for Imaging Cancer Metabolism with PET

Molecules ◽  
2020 ◽  
Vol 25 (9) ◽  
pp. 2024 ◽  
Author(s):  
Bernhard Sattler ◽  
Mathias Kranz ◽  
Barbara Wenzel ◽  
Nalin T. Jain ◽  
Rareş-Petru Moldovan ◽  
...  
Keyword(s):  
Positron Emission Tomography ◽  
Urinary Bladder ◽  
Cancer Metabolism ◽  
Emission Tomography ◽  
Whole Body ◽  
Organ Doses ◽  
Time Activity ◽  
Weighting Factors ◽  
Red Marrow ◽  
Positron Emission

Overexpression of monocarboxylate transporters (MCTs) has been shown for a variety of human cancers (e.g., colon, brain, breast, and kidney) and inhibition resulted in intracellular lactate accumulation, acidosis, and cell death. Thus, MCTs are promising targets to investigate tumor cancer metabolism with positron emission tomography (PET). Here, the organ doses (ODs) and the effective dose (ED) of the first 18F-labeled MCT1/MCT4 inhibitor were estimated in juvenile pigs. Whole-body dosimetry was performed in three piglets (age: ~6 weeks, weight: ~13–15 kg). The animals were anesthetized and subjected to sequential hybrid Positron Emission Tomography and Computed Tomography (PET/CT) up to 5 h after an intravenous (iv) injection of 156 ± 54 MBq [18F]FACH. All relevant organs were defined by volumes of interest. Exponential curves were fitted to the time–activity data. Time and mass scales were adapted to the human order of magnitude and the ODs calculated using the ICRP 89 adult male phantom with OLINDA 2.1. The ED was calculated using tissue weighting factors as published in Publication 103 of the International Commission of Radiation Protection (ICRP103). The highest organ dose was received by the urinary bladder (62.6 ± 28.9 µSv/MBq), followed by the gall bladder (50.4 ± 37.5 µSv/MBq) and the pancreas (30.5 ± 27.3 µSv/MBq). The highest contribution to the ED was by the urinary bladder (2.5 ± 1.1 µSv/MBq), followed by the red marrow (1.7 ± 0.3 µSv/MBq) and the stomach (1.3 ± 0.4 µSv/MBq). According to this preclinical analysis, the ED to humans is 12.4 µSv/MBq when applying the ICRP103 tissue weighting factors. Taking into account that preclinical dosimetry underestimates the dose to humans by up to 40%, the conversion factor applied for estimation of the ED to humans would rise to 20.6 µSv/MBq. In this case, the ED to humans upon an iv application of ~300 MBq [18F]FACH would be about 6.2 mSv. This risk assessment encourages the translation of [18F]FACH into clinical study phases and the further investigation of its potential as a clinical tool for cancer imaging with PET.

scholarly journals Measurement of Changes in Opioid Receptor Binding in Vivo During Trigeminal Neuralgic Pain Using [11C]Diprenorphine and Positron Emission Tomography

1999 ◽  
Vol 19 (7) ◽  
pp. 803-808 ◽  
Author(s):  
Anthony K. P. Jones ◽  
Niel D. Kitchen ◽  
Hiroshi Watabe ◽  
Vincent J. Cunningham ◽  
Terry Jones ◽  
...  
Keyword(s):  
Positron Emission Tomography ◽  
Volume Of Distribution ◽  
Emission Tomography ◽  
Subcortical Structures ◽  
Endogenous Opioid ◽  
Positron Emission ◽  
Before And After ◽  
Pain State ◽  
Parietal Cortices

The binding of [11C]diprenorphine to µ, κ, and Δ subsites in cortical and subcortical structures was measured by positron emission tomography in vivo in six patients before and after surgical relief of trigeminal neuralgia pain. The volume of distribution of [11C]diprenorphine binding was significantly increased after thermocoagulation of the relevant trigeminal division in the following areas: prefrontal, insular, perigenual, mid-cingulate and inferior parietal cortices, basal ganglia, and thalamus bilaterally. In addition to the pain relief associated with the surgical procedure, there also was an improvement in anxiety and depression scores. In the context of other studies, these changes in binding most likely resulted from the change in the pain state. The results suggest an increased occupancy by endogenous opioid peptides during trigeminal pain but cannot exclude coexistent down-regulation of binding sites.

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