Usefulness of 99mTc-Pertechnetate SPECT-CT in Thyroid Tissue Volumetry : Phantom Studies and a Clinical Case Series
Copyright© Bentham Science Publishers; For any queries, please email at epubbenthamscience.net..
BACKGROUND: An accurate measurement of the target volume is of primary importance in theragnostics of hyperthyroidism.
OBJECTIVE: Our purpose was to evaluate the accuracy of a threshold-based isocontour extraction procedure for thyroid tissue volumetry from SPECT-CT.
METHODS: Cylindrical vials with a fixed volume of 99mTcO4 at different activities were inserted into a neck phantom in two different thickness settings. Images were acquired by orienting the phantom in different positions, i.e., 40 planar images and 40 SPECT-CT. The fixed values of the isocontouring threshold for SPECT and SPECT-CT were calculated by means of linear and spline regression models. Mean, Median, Standard Deviation, Standard Error, Mean Absolute Percentage Error and Root Mean-Square Error were computed. Any difference between the planar method, SPECT and SPECT-CT and the effective volume was evaluated by means of ANOVA and posthoc tests. Moreover, planar and SPECT-CT acquisitions were performed in 8 patients with hyperthyroidism, considering relevant percentage differences greater than > 20% from the CT gold standard.
RESULTS: Concerning phantom studies, the planar method shows higher values of each parameter than the other two methods. SPECT-CT shows lower variability. However, no significant differences were observed between SPECT and SPECT-CT measurements. In patients, relevant differences were found in 7 out of 9 lesions with the planar method, in 6 lesions with SPECT, but in only one with SPECT-CT.
CONCLUSION: Our study confirms the superiority of SPECT in volume measurement if compared with the planar method. A more accurate measurement can be obtained from SPECT-CT.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2022 |
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| Erschienen: |
2022 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:15 |
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| Enthalten in: |
Current radiopharmaceuticals - 15(2022), 3 vom: 04., Seite 205-217 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Calandri, Enrico [VerfasserIn] |
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| Links: |
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| Themen: |
A0730CX801 |
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| Anmerkungen: |
Date Completed 28.07.2022 Date Revised 28.07.2022 published: Print Citation Status MEDLINE |
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| doi: |
10.2174/1874471015666220111145550 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM335568815 |
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| 100 | 1 | |a Calandri, Enrico |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Usefulness of 99mTc-Pertechnetate SPECT-CT in Thyroid Tissue Volumetry |b Phantom Studies and a Clinical Case Series |
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| 500 | |a Date Revised 28.07.2022 | ||
| 500 | |a published: Print | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a Copyright© Bentham Science Publishers; For any queries, please email at epubbenthamscience.net. | ||
| 520 | |a BACKGROUND: An accurate measurement of the target volume is of primary importance in theragnostics of hyperthyroidism | ||
| 520 | |a OBJECTIVE: Our purpose was to evaluate the accuracy of a threshold-based isocontour extraction procedure for thyroid tissue volumetry from SPECT-CT | ||
| 520 | |a METHODS: Cylindrical vials with a fixed volume of 99mTcO4 at different activities were inserted into a neck phantom in two different thickness settings. Images were acquired by orienting the phantom in different positions, i.e., 40 planar images and 40 SPECT-CT. The fixed values of the isocontouring threshold for SPECT and SPECT-CT were calculated by means of linear and spline regression models. Mean, Median, Standard Deviation, Standard Error, Mean Absolute Percentage Error and Root Mean-Square Error were computed. Any difference between the planar method, SPECT and SPECT-CT and the effective volume was evaluated by means of ANOVA and posthoc tests. Moreover, planar and SPECT-CT acquisitions were performed in 8 patients with hyperthyroidism, considering relevant percentage differences greater than > 20% from the CT gold standard | ||
| 520 | |a RESULTS: Concerning phantom studies, the planar method shows higher values of each parameter than the other two methods. SPECT-CT shows lower variability. However, no significant differences were observed between SPECT and SPECT-CT measurements. In patients, relevant differences were found in 7 out of 9 lesions with the planar method, in 6 lesions with SPECT, but in only one with SPECT-CT | ||
| 520 | |a CONCLUSION: Our study confirms the superiority of SPECT in volume measurement if compared with the planar method. A more accurate measurement can be obtained from SPECT-CT | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a SPECT | |
| 650 | 4 | |a SPECT-CT | |
| 650 | 4 | |a Thyroid | |
| 650 | 4 | |a hyperthyroidism | |
| 650 | 4 | |a theragnostics | |
| 650 | 4 | |a thyroid tissue volumetry | |
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| 700 | 1 | |a Sirovich, Roberta |e verfasserin |4 aut | |
| 700 | 1 | |a Ostan, Antonella |e verfasserin |4 aut | |
| 700 | 1 | |a Pultrone, Mirco |e verfasserin |4 aut | |
| 700 | 1 | |a Frantellizzi, Viviana |e verfasserin |4 aut | |
| 700 | 1 | |a Conversano, Lucia |e verfasserin |4 aut | |
| 700 | 1 | |a Bagnasacco, Paolo |e verfasserin |4 aut | |
| 700 | 1 | |a Gallina, Sonya |e verfasserin |4 aut | |
| 700 | 1 | |a Vincentis, Giuseppe De |e verfasserin |4 aut | |
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