You will need third-party software like VueScan, which supports legacy TWAIN drivers for the e-Studio 181.
Toshiba e-STUDIO 181 is a monochrome laser multi-function printer (MFP) designed for small to medium-sized offices that require versatile, high-volume performance Core Capabilities & Performance 3-in-1 Versatility: toshiba e studio 181 printer driver download
Before starting, ensure the printer is connected and powered on. How to Install Toshiba Printer Drivers on Mac OS Devices The Complete Guide to Toshiba e-Studio 181 Printer