Histotripsy Bubble Dynamics in Elastic, Anisotropic Tissue-Mimicking Phantoms

Elliott, Jacob C.; Simon, Julianna C.

doi:10.1016/j.ultrasmedbio.2022.11.012

Cited by 5 publications

(3 citation statements)

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“…Phantoms mimicking parenchymal and connective tissue have previously been described for histotripsy treatment parameter characterization and development. [17][18][19][20][21][22][23][24][25] Of note, Maxwell et al 18 proposed an agarose gel-based phantom with suspended bovine red blood cells for ultrasound evaluation of histotripsy. This phantom allowed clear visualization of histotripsy treatments on ultrasound as hypo-echoic regions caused by the rupture of individual red blood cells.…”

Section: Introductionmentioning

confidence: 99%

“…Phantoms provide a low‐cost, controlled, and reproducible environment for the development, characterization, and QA of targeting techniques. Phantoms mimicking parenchymal and connective tissue have previously been described for histotripsy treatment parameter characterization and development 17–25 . Of note, Maxwell et al 18 .…”

Section: Introductionmentioning

confidence: 99%

“…Phantoms mimicking parenchymal and connective tissue have previously been described for histotripsy treatment parameter characterization and development. 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 Of note, Maxwell et al. 18 proposed an agarose gel‐based phantom with suspended bovine red blood cells for ultrasound evaluation of histotripsy.…”

Section: Introductionmentioning

confidence: 99%

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A target containing phantom for accuracy assessment of cone‐beam CT‐guided histotripsy

Kutlu,

Minesinger,

Laeseke

et al. 2024

J Applied Clin Med Phys

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PurposeHistotripsy is a nonionizing, noninvasive, and nonthermal focal tumor therapy. Cone‐beam computed tomography (CBCT) guidance was developed for targeting tumors not visible on ultrasound. This approach assumes cavitation is formed at the geometrical focal point of the therapy transducer. In practice, the exact location might vary slightly between transducers. In this study, we present a phantom with an embedded target to evaluate CBCT‐guided histotripsy accuracy and assess the completeness of treatments.MethodsSpherical (2.8 cm) targets with alternating layers of agar and radiopaque barium were embedded in larger phantoms with similar layers. The layer geometry was designed so that targets were visible on pre‐treatment CBCT scans. The actual histotripsy treatment zone was visualized via the mixing of adjacent barium and agar layers in post‐treatment CBCT images. CBCT‐guided histotripsy treatments of the targets were performed in six phantoms. Offsets between planned and actual treatment zones were measured and used for calibration refinement. To measure targeting accuracy after calibration refinement, six additional phantoms were treated. In a separate investigation, two groups (N = 3) of phantoms were treated to assess visualization of incomplete treatments (“undertreatment” group: 2 cm treatment within 2.8 cm tumor, “mistarget” group: 2.8 cm treatment intentionally shifted laterally). Treatment zones were segmented (3D Slicer 5.0.3), and the centroid distance between the prescribed target and actual treatment zones was quantified.ResultsIn the calibration refinement group, a 2 mm offset in the direction of ultrasound propagation (Z) was measured. After calibration refinement, the centroid‐to‐centroid distance between prescribed and actual treatment volumes was 0.5 ± 0.2 mm. Average difference between the prescribed and measured treatment sizes in the incomplete treatment groups was 0.5 ± 0.7 mm. In the mistarget group, the distance between prescribed and measured shifts was 0.2 ± 0.1 mm.ConclusionThe proposed prototype phantom allowed for accurate measurement of treatment size and location, and the CBCT visible target provided a simple way to detect misalignments for preliminary quality assurance of CBCT‐guided histotripsy.

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